concurring.
The majority holds that a defendant charged with criminal homicide is entitled upon request to a jury instruction providing a complete statutory definition of the offense of voluntary manslaughter. I agree. Commonwealth v. Cain, 471 Pa. 140, 171, 369 A.2d 1234, 1250 (1977) (Opinion in Support of Reversal of Roberts, J., joined by O’Brien and Manderino, JJ.); Commonwealth v. Jones, 457 Pa. 563, 577, 319 A.2d 142, 150 (1974) (Opinion in Support of Reversal of Roberts, J., joined by Pomeroy and Manderino, JJ.), cert. denied, 419 U.S. 1000, 95 S.Ct. 316, 42 L.Ed.2d 274 (1974).