*419OPINION
By the Court,
Steffen, C. J.:This is an appeal from a district court order denying appellant Frank Salvatore D’Agostino’s motion for a new trial based upon newly-discovered evidence. D’Agostino contends that numerous facts unknown to him at trial indicate that a critical state witness was receiving favorable treatment from the State concerning various criminal matters, and that the nature of the treatment strongly suggests that there was an agreement between the witness and the State. D’Agostino also maintains that the key witness and the prosecution committed perjury in denying the existence of the alleged agreement, and that because the extent of the cooperation between the State and the key witness was discovered and discoverable only after trial, the district court erred in denying his motion for a new trial. For reasons which will be discussed hereinafter, we conclude that the district court properly exercised its discretion in denying D’Agostino’s new trial motion, and therefore affirm.
I.
PROCEDURAL HISTORY
D’Agostino was tried and convicted by a jury of first-degree murder and sentenced to death. On direct appeal, this court affirmed the conviction, but vacated the death penalty and remanded the matter for a new penalty hearing. See D’Agostino v. State, 107 Nev. 1001, 823 P.2d 283 (1991). Subsequent to the disposition of his direct appeal, D’Agostino unsuccessfully sought a new trial based upon newly-discovered evidence. The instant appeal is from the district court’s order denying D’Agostino’s motion for a new trial.
II.
FACTS
Since our original disposition of D’Agostino addressed only penalty-phase error, there was no recital of the basic operative facts underlying D’Agostino’s conviction for the first-degree murder of a young woman. We therefore now take the occasion to memorialize the factual background of this case as reflected by the trial evidence.
The murder occurred on April 24, 1989. Events leading up to the homicide include the arrival of the victim, Eleanor (Ellie) Panzarella, in Las Vegas on April 22, 1989. Shortly after her *420arrival, she met and developed a short-lived friendship with Ruben Varela. After an evening of drinking and gambling, the two quarreled, experienced some brief, non-friendly physical contact, and Varela left alone in a taxicab. Earlier in the day, Ellie agreed to let Varela store his luggage in her newly-rented apartment before obtaining his own place. That day, Ellie and Varela met D’Agostino and his wife, Rose Lakel, who had an apartment in the same complex as the victim. Rose offered dishes and glasses to Ellie, which D’Agostino took to the victim’s apartment. While there, D’Agostino told Varela and Ellie that he could obtain drugs for them if they so desired. Varela gave D’Agostino $200 for some cocaine which he was to pick up later.
After the heated argument with Varela, Ellie returned to her apartment in the company of Jack Green, who was with her as a proffered source of protection from Varela. Both Ellie and Green watched as Varela walked through the apartment complex making a disturbance, including what was later identified as a confrontation with D’Agostino regarding the cocaine he had purchased but not received. Eventually, Ellie was able to remove Varela’s luggage and place it in the office of the apartment complex, where he later retrieved it. Varela left Ellie a note, and after four days, moved to Arizona where he anticipated better opportunities for purchasing marijuana in large quantities. Varela testified that he never saw Ellie again.
On the evening of April 23 and the morning of April 24, D’Agostino periodically left his wife, Rose, and spent time with Ellie in the latter’s apartment. At one point during the night, D’Agostino returned to his apartment, where his wife, Rose, saw him wrap baking soda and a steak knife in a newspaper before leaving again. During the early morning hours of April 24, Renita Brown, who occupied an apartment next to Elbe’s, overheard a fight in progress in the victim’s apartment that included sounds of a woman calling for help, and what appeared to be someone being banged up against a wall. Brown did not have a telephone and made no attempt to contact the police or any other possible sources of help.
Rose Lakel testified that when D’Agostino returned to their apartment on the morning of April 24, he was sweating and had blood on his face, in his mouth, on his hands, and on his clothes from his waist down to and including his shoes. D’Agostino removed from the back of his pants the same steak knife that he had taken earlier. Rose noticed that there were brownish, orange pieces of “meat,” blood, and a single curly, black hair on the knife. Ellie had curly, black hair. Rose also noticed that when D’Agostino removed his clothes to take a shower, he had blood around his penis and on his thighs. D’Agostino also threw on the *421couch a plastic bag containing five or six hundred dollar bills and various pieces of jewelry that had not previously been among his possessions.
Over the next few days, Rose noticed that D’Agostino would return to their apartment on several occasions with a “horrible smell” on his person. Additionally, a friend, Anthony Wells, stayed with D’Agostino and Rose for several days following April 24. Both Wells and Rose saw that D’Agostino had in his possession the victim’s driver’s license and credit card.
On two occasions while Wells was staying with D’Agostino, he accompanied D’Agostino to Elbe’s apartment where they rummaged through her belongings. During one such visit, Wells assisted D’Agostino in moving a mattress off of Elbe’s body. Webs then saw D’Agostino turn on the air conditioner and spray perfume in the apartment. Webs testified that each time they went to the victim’s apartment, D’Agostino gained entry by using a key. The trial evidence indicated that Varela had never been given a key to the apartment, and that D’Agostino had never received a key from either the victim or Varela.
D’Agostino also called Webs at the former’s apartment, and both Webs and Rose heard D’Agostino ask Wells to make a “champagne cocktail” and throw it through Elbe’s apartment window in order to eliminate evidence of their fingerprints. Although expressing agreement, Webs did not comply with D’Agostino’s request. Not long after that conversation, D’Agostino and Rose took a taxicab to a convenience store where D’Agostino purchased six bottles of rubbing alcohol, matches, and cigarettes. After returning to their apartment, D’Agostino experimented with pouring alcohol on the floor and then igniting it with a burning cigarette and matches. Later, D’Agostino telephoned Webs and told him that he “done set it afire and it should be going up anytime now.”
The evidence also demonstrated that on April 25, Webs and D’Agostino pawned the jewelry that D’Agostino had acquired. D’Agostino used Webs in the transaction because D’Agostino had no identification. The items of jewelry pawned for $490 included four diamond rings, a gold and diamond pendant, a pair of gold earrings, and a gold necklace. These items were identified as being jewelry that was similar or identical to that owned by the victim. Moreover, Rose testified that there were items of jewelry brought to their apartment by D’Agostino that included pieces with the initial “E” on them, which D’Agostino flushed down the toilet.
On May 2, 1989, Elbe’s body was found by employees of the apartment complex. Part of the victim’s body and apartment had been burned by fire fueled by rubbing alcohol. Elbe had been *422stabbed numerous times in the chest and back, and later, thirty to forty percent of the surface of her body had been burned. The victim died from two stab wounds that penetrated her heart. A piece of wire was tightly wrapped around the victim’s left ankle, and no jewelry or money was found in her apartment.
After noticing the police, D’Agostino and Rose left their apartment for a day and stayed in a motel. The following day, they returned to the apartment, packed their belongings, and left for Phoenix, Arizona. During their three-week stay in Phoenix, Rose gave birth to a baby girl. Eventually, the couple moved to Tampa, Florida, where they lived for several months. On February 9, 1990, the couple had a fight and Rose reported the incident to the police. During the course of reporting spousal abuse to the police, she explained, for the first time, the details of what had occurred in Las Vegas. She had delayed speaking to the authorities about the bizarre events in Las Vegas out of fear for her own life and the lives of her family. Rose gave a detailed statement to the Tampa police, and was eventually flown back to Las Vegas for further investigation of the Panzarella homicide.
While D’Agostino was incarcerated in Florida, he revealed the details of Ellie’s murder to a cellmate, Michael Gaines, who thereafter informed the police and ultimately testified at D’Agostino’s trial.
As noted above, D’Agostino was tried before a jury, and convicted of first-degree murder and sentenced to death. This court affirmed D’Agostino’s conviction, but vacated the death sentence and remanded for a new penalty hearing. In the interim, D’Agostino now challenges on appeal the district court’s denial of his motion for a new trial.
DISCUSSION
D’Agostino contends that the district court erred in denying his motion for a new trial. The basis for D’Agostino’s motion was newly-discovered evidence that would likely yield a different trial result because of the critical nature of the testimony of his wife, Rose Lakel, and the negative impact his “newly discovered” evidence would have on her credibility and the bona fides of the State’s prosecution.
D’Agostino insists that the fact that several misdemeanor charges against Rose, the State’s key witness, were dismissed, and a felony charge against her reduced to a misdemeanor, strongly demonstrates that an agreement between the State and Rose existed. Accordingly, D’Agostino contends that Rose Lakel, two investigators, and the prosecutor perjured themselves when each denied the existence of such an agreement. D’Agostino *423therefore maintains that the trial court erred in denying his motion because this alleged agreement was never disclosed to the defense, and consequently violated his rights to due process. We disagree.
To merit a new trial, newly-discovered evidence must be evidence that could not have been discovered through reasonable diligence either before or during trial. Sanborn v. State, 107 Nev. 399, 406, 812 P.2d 1279, 1284 (1991). Although evidence that the charges against Rose were disposed of after the trial could not have been discovered prior to trial, evidence of the pending misdemeanor and felony charges was presented to the jury. This provides the basis, which the prosecutor in this case twice mentioned to defense counsel outside the jury’s presence, for defense counsel’s examination of Rose concerning any agreement or possible bias she may have had. See Davis v. Alaska, 415 U.S. 308, 317-18 (1974) (cross-examination of witness to develop potential bias is permissible). During trial, defense counsel cross-examined Rose concerning any possible agreement. Thus, we conclude that the district court did not abuse its discretion in denying D’Agostino’s motion for a new trial.
Moreover, newly-discovered evidence must be “such as to render a different result probable on retrial; not only an attempt to contradict, impeach, or discredit, a former witness, unless the witness is so important that a different result would be reasonably probable.” Sanborn, 107 Nev. at 406, 812 P.2d at 1284-85. The district court found that “since the issue of benefits received and/ or promised to Rose Lakel was fully explored at trial, the information now proffered by the defense is not such as to render a different result probable upon retrial.”
At trial, defense counsel and/or the prosecutor questioned Rose about the following: the witness having received a traffic warrant, a trespass warrant, a soliciting prostitution warrant, and a grand larceny warrant; whether these warrants had been actively pursued; detectives having successfully released Rose from jail five days after incarceration; Rose’s previous drug history; and the circumstances and timing of secret witness funds Rose received and the possible impact of the money on her testimony. Despite this evidence suggesting cooperation with the State, Rose consistently denied that she was working with the police, that she was receiving any benefit for her testimony from the police, or that she consciously weighed the existing warrants or the potential secret witness money when she went to the authorities. Even defense counsel, outside the presence of the *424jury, stated, “[mjaybe she [Rose] doesn’t think she is [working with the police], but I think the inference is that Metro thinks she is.” See Ransey v. State, 100 Nev. 277, 279, 680 P.2d 596, 597 (1984) (holding that bias of witness is always relevant to credibility); see also Davis v. Alaska, 415 U.S. 308, 320 (1974) (quoting Alford v. United States, 282 U.S. 687, 693 (1931)). Given the extent to which areas of cooperation between Rose and the police was explored, we are persuaded that the trial court did not abuse its discretion in finding that evidence of the dismissed warrants was not sufficiently material to render a different result probable upon retrial. McCabe v. State, 98 Nev. 604, 608, 655 P.2d 536, 538 (1982) (holding that the granting of a new trial on the grounds of newly discovered evidence is largely discretionary with the trial court and that the trial court’s determination will not be disturbed unless an abuse of discretion is clearly shown).
Moreover, despite the fact that Rose Lakel was indeed a key witness for the State, we are convinced from our review of the record, that the evidence against D’Agostino was overwhelming. Although D’Agostino would have had the jury believe that he was guilty only of grand larceny and arson, and that Varela killed Ellie during a brief period when he left for a nearby store and returned to find her dead (the story communicated at trial by witness Anthony Wells related what D’Agostino told him), the evidence is clearly to the contrary. Where, as here, evidence of guilt is overwhelming, there is great reason to extend deference to the district court’s discretionary denial of D’Agostino’s new trial motion. Cf. Pacheco v. State, 81 Nev. 639, 641, 408 P.2d 715, 716 (1965) (adopting standard that the new evidence must be such as to render a different result probable on retrial. Stating that such standard calls for an exercise of discretion by the trial court).
Finally, we note that the district court, in its oral denial of D’Agostino’s new trial motion, found that D’Agostino “failed to satisfy the criteria for meriting a new trial under NRS 176.515(3).” NRS 176.515(3) provides that “[a] motion for a new trial based on the ground of newly discovered evidence may be made only within 2 years after the verdict or finding of guilt.”
On October 30, 1990, D’Agostino’s jury returned a verdict of guilty. D’Agostino was sentenced to death on December 12, 1990, and filed his motion for a new trial on August 13, 1993, well after D’Agostino was convicted of Ellie’s murder. D’Agostino nevertheless contends that the two-year statutory period commences at the conclusion of the proceedings, meaning, in a capital case, after a variety of appeals and the final *425verdict and imposition of sentence, which, he contends, could not occur until after this appeal.
We disagree and conclude that the district court did not err in finding that D’Agostino did not comply with NRS 176.515(3). In Snow v. State, 105 Nev. 521, 779 P.2d 96 (1989), this court upheld the trial court’s denial of a motion for a new trial, not on its merits, but on the court’s conclusion that it lacked jurisdiction. Id. at 522-23, 779 P.2d at 97. Snow involved a defendant who received the death sentence and later claimed to have discovered evidence that a key witness committed perjury. This court concluded that the two-year limit was not unconstitutional because a defendant sentenced to death may bring such evidence “before the court for consideration, even after the two-year time limit imposed by NRS 176.515(3) has run, in a petition for a writ of habeas corpus.” Id. at 523, 779 P.2d at 97. Implicitly, Snow contradicts D’Agostino’s contention that the two-year window begins after the conclusion of all appeals in a capital case. Additionally, we conclude, as we did in Snow, that D’Agostino would not be foreclosed from seeking habeas relief despite the two-year period of limitations under NRS 176.515(3).
CONCLUSION
For the reasons discussed above, we conclude that the district court did not err in denying D’Agostino’s motion for a new trial. We accordingly affirm.
Young, Shearing, and Rose, JJ., concur.