150 A.2d 863 Commonwealth v. Davis, Appellant. Supreme Court of Pennsylvania.March 17, 1958. Reargued March 16, 1959. May 8, 1959. Criminal law — Murder — First degree — Defendant’s criminal record — Prior convictions — Evidence — Admissibility — Credibility of defendant — Cross-examination concerning criminal record — Act of March 15, 1911, P.L. 20. […]