What is the test for a jury to find a defendant guilty of voluntary manslaughter?

whether or not instructions are requested by counsel, whenever there is evidence substantial enough to merit consideration by the jury that under this doctrine the defendant is guilty of voluntary manslaughter.' " (People v. Manriquez (2005) 37 Cal.4th 547, 581.) " 'Fear of future harmno matter how great the fear and no matter how great the likelihood of the harmwill not suffice. The defendant's fear must be of imminent danger to life or great bodily injury. " '[T]he peril must appear to the defendant as immediate and present and not prospective or even in the near future. An imminent peril is one that, from appearances, must be instantly dealt with.' " ' " (Ibid.)