494 U.S. 299 494 U.S. 299 110 S.Ct. 1078 108 L.Ed.2d 255 Scott Wayne BLYSTONE, Petitionerv.PENNSYLVANIA. No. 88-6222. Argued Oct. 10, 1989. Decided Feb. 28, 1990. Syllabus After convicting petitioner of robbery, first-degree murder, and related crimes, a Pennsylvania jury—having found as an aggravating circumstance that petitioner committed a killing while in the perpetration of […]