Opinion by
Mr. Justice Walling,This is a workmen’s compensation case. Minor T. Keyes, the deceased, was in the defendant’s employ as an engine hostler. He was last seen alive at 2:30 a. m. of November 23,1916, working on an engine at Mayfield in Lackawanna County, and ten minutes later was found lying on the ground by the engine dead as the result of a bullet wound through his jaw. There was nothing to indicate suicide and the referee found, inter alia, that, *107“Whether or not the injury which resulted in the decedent’s death, was caused by an act of a third person, cannot be found, or was not proven by either party”; also found as a conclusion of law, “That the decedent’s death is the result of such an ‘injury by accident in the course of his employment,’ as is contemplated in the Workmen’s Compensation Act of 1915.” On this the referee made an award in favor of Mrs. Keyes and her minor child, which was affirmed by the compensation board but reversed by the court below; hence this appeal by claimants.
In Section 301 of Article III of the Act of June 2, 1915, P. L. 736, it is provided, “The term ‘injury by an accident in the course of his employment,’ as used in this article, shall not include an injury caused by an act of a third person intended to injure the employee because of reasons personal to him, and not directed against him as an employee or because of his employment; but shall include all other injuries sustained while the employee is actually engaged in the furtherance of the business or affairs of the employer.” Earlier in the same section there is a provision, “that no compensation shall be made when the injury or death be intentionally self-inflicted, but the burden of proof of such fact shall be upon the employer.” In answer to the claim-petition, defendant set up, inter alia, “That the injury resulting in the death of said employee was caused by an act of a third person intended to injure the employee because of reasons personal to him, and not directed against him as an employee or because of his employment.” The case turns on the burden of proof as to that fact; the lower court held it was upon the claimants, while the compensation board held it was upon the defendant. We agree with the latter. The general rule is one of liability for violent injury suffered by an employee in the course of his employment, as this undoubtedly was; the exception is that the employer is not liable for “an injury caused by an act of a third person intended to injure the employee be*108cause of reasons personal to him.” The burden of proving the exception rests upon the party interposing it as a defense, for as to that issue he holds the affirmative. See Zerbe v. Miller, 16 Pa. 488; 16 Cyc. 928. The burden of proof of a particular allegation rests upon the side to whose case it is necessary, and that is the defendant here. See 5 Am. & Eng. Enc. of L. (2d ed.), p. 24.
A claimant’s case is prima facie made out by proof of affirmative facts showing the employer’s liability, and that rule is not changed by the fact that earlier in the section the burden of proving suicide is expressly placed upon the employer. When, as here, there is nothing to throw light upon the occurrence, it would impose an unreasonable burden upon claimants and defeat the beneficent purpose of the act to require them to establish the negative proposition that the injury was not inflicted by a third person because of some reason personal to the employee. The court below concludes, in effect, that the affirmative of the proposition should be presumed, as it was not suicide; but that view cannot be accepted. There is always a presumption of innocence and we cannot assume that the wound was feloniously inflicted. It may have been accidental. No one heard the sound of a shot or knows whence it came. It was in the dark and may have been a random shot discharged by some officer or other person for an innocent purpose and with no thought of harm. Probably not one shot in twenty fired upon the street is with felonious intent; so the fact that a man sustains a fatal bullet wound, while exposed at night, does not of itself prove an intentional homicide. To sustain defendant’s contention we must presume a felonious homicide and add to that the further presumption that it was committed because of some reason personal to the victim. Assuming a wilful killing, it may have been because of the employment or from some other motive, entirely aside from Mr. Keyes, and by a stranger, or by one possessed of a homicidal mania, in which cases the employer would be liable. Our act is broad and em*109braces cases of injury sustained in course of the employment, although not arising therefrom, and therein differs from enactments in many jurisdictions. See opinion of this court by Mr. Justice Moschzisker in Clark v. Lehigh Valley Coal Company, 264 Pa. 529.
As there was no hearing de novo by the board, the case rests upon the facts found by the referee (McCauley v. Imperial Woolen Co. et al., 261 Pa. 312), and it has been so considered at every stage.
The judgment of the court below is reversed and the award of the referee, as affirmed by the compensation board, is reinstated.