Can a jury at a murder trial agree unanimously on a single theory of murder?

In People v. Guerra (1985) 40 Cal.3d 377, the defendant argued the trial court erroneously refused "to give an instruction requiring the jurors to agree unanimously on a single theory of first degree murder in order to return a first degree murder conviction. It is settled, however, that 'in a prosecution for first degree murder it is not necessary that all jurors agree on one or more of several theories proposed by the prosecution; it is sufficient that each juror is convinced beyond a reasonable doubt that the defendant is guilty of first degree murder as that offense is defined by the statute.' [Citation.] Defendant provides no compelling reason or authority that would require us to depart from this rule, and we decline to do so." (Id. at p. 386, italics added.)

Page 31