Does the Attorney General admit that the trial court erred by not instructing the jury on involuntary manslaughter?

The Attorney General concedes that the trial court erred by not instructing on involuntary manslaughter, having found that sufficient evidence supported the instruction, and we will assume without deciding that the court should have given the instruction. We therefore turn to whether the error was prejudicial, which the parties agree is assessed under People v. Watson (1956) 46 Cal.2d 818, 836. Applying that standard, we ask whether it is reasonably probable that Young would have received a more favorable verdict had the jury been instructed on involuntary manslaughter. (See ibid.)