sustain a conviction for manslaughter if the jury believed the testimony of the defendant, and he contends that the judgment must be reversed because the trial judge did not instruct the jury or submit a form of verdict with respect to that offense. Many decisions of this court have stated that “ if there is any evidence in the record which, if believed by the jury, would reduce a charge of murder to manslaughter, an instruction defining that crime should be given. (People v. Brown, 415 Ill. 23; People v. Newman, 360 Ill. 226; People v. Beil, 322 Ill. 434; People v. Tokoly, 313 Ill. 177.)” (People v. Harris,* 8 Ill.2d 431, 434). Under these authorities it is immaterial that the defendant did not request a manslaughter instruction, or objected to it.
On the other hand it has been held that the failure to give a manslaughter instruction cannot be asserted as a ground for reversal in a reviewing court unless such an instruction has been requested. (People v. Weisberg, 396 Ill. 412; People v. Harrison, 395 Ill. 463, 477.) The reason for this rule was thus stated in People v. Lucas, 244 Ill. 603, 614: “No such instructions having been asked by plaintiff in error, the court had a right to assume that plaintiff in error preferred to submit the case to the jury in such way that the jury would be compelled to find the defendants guilty of murder or not guilty. It was the right of plaintiff in error to submit that question to the jury and require the jury to pass on the question of his guilt or innocence of the crime of murder, and it was not the duty of the court to submit issues and questions to the jury which the parties, by their action, said they did not desire passed upon.” This statement was quoted with approval in People v. Harrison, 395 Ill. 463, 477.
To speak of the “right” of a defendant to require the jury to pass only upon his guilt or innocence of murder is misleading. If a jury trial is waived, the judge determines from the evidence whether the defendant is guilty of murder or of some lesser included offense, and the defendant has