concurring:
For the reasons expressed in my concurring opinion in Commonwealth v. Polimeni, 474 Pa. 430, 378 A.2d 1189 (1977), I join in the result reached by the Court in this case. I repeat, however, that in any case in which a defendant is charged with criminal homicide, he or she is entitled upon timely request to have the jury instructed as to the elements of the crime of involuntary manslaughter — regardless of the evidence presented at trial.