The defense theories that the attacker formed the intent to rob only after the assault upon his victim or that the robbery and the murder were committed by two different persons are not supported by the evidence, and instructions based solely on conjecture and speculation are improper. ( People v. Bross (1966) 240 Cal.App.2d 157, 168-169 [ 49 Cal.Rptr. 402]; People v. Renkin (1965) 232 Cal.App.2d 328, 331 [ 42 Cal.Rptr. 657].) The judgment is affirmed.