What is the standard of review applied in a murder case?

"We apply the independent or de novo standard of review to the failure by the trial court to instruct on an assertedly lesser included offense. [Citation.]" (People v. Cole (2004) 33 Cal.4th 1158, 1218.)

"In criminal cases, even absent a request, the trial court must instruct on general principles of law relevant to the issues raised by the evidence. [Citation.] This obligation includes giving instructions on lesser included offenses when the evidence raises a question whether all the elements of the charged offense were present, but not when there is no evidence the offense was less than that charged. [Citation.]" (People v. Koontz (2002) 27 Cal.4th 1041, 1085.) "[T]he existence of 'any evidence, no matter how weak' will not justify instructions on a lesser included offense, but such instructions are required whenever evidence that the defendant is guilty only of the lesser offense is 'substantial enough to merit consideration' by the jury. [Citations.] 'Substantial evidence' in this context is '"evidence from which a jury composed of reasonable [persons] could . . . conclude[ ]"' that the lesser offense, but not the greater, was committed. [Citations.]"

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(People v. Breverman (1998) 19 Cal.4th 142, 162; People v. Barton (1995) 12 Cal.4th 186, 200-201 [a trial court need instruct on a lesser included offense only when there is substantial evidence, "not when the evidence is 'minimal and insubstantial'"].)

"'Murder is the unlawful killing of a human being . . . with malice aforethought.' [Citation.] 'Such malice may be express or implied. It is express when there is manifested a deliberate intention unlawfully to take away the life of a fellow creature. It is implied, when no considerable provocation appears, or when the circumstances attending the killing show an abandoned and malignant heart.' [Citation.] 'Murder that is committed with malice but is not premeditated is of the second degree.' [Citations.]" (People v. Prince (2007) 40 Cal.4th 1179, 1265-1266.) "Malice will be implied 'when the killing results from an intentional act, the natural consequences of which are dangerous to life, which act was deliberately performed by a person who knows that his conduct endangers the life of another and who acts with conscious disregard for life. [Citations.]' [Citations.]" (People v. Taylor (2010) 48 Cal.4th 574, 623-624.)

Section 31 provides, "All persons concerned in the commission of a crime . . . whether they directly commit the act constituting the offense, or aid and abet in its commission, . . . are principals in any crime so committed." "[A]n aider and abettor's liability for criminal conduct is of two kinds. First, an aider and abettor with the necessary mental state is guilty of the intended crime. Second, under the natural and probable consequences doctrine, an aider and abettor is guilty not only of the intended crime, but also 'for any other offense that was a "natural and probable consequence" of the crime aided and abetted.' [Citation.]" (People v. McCoy (2001) 25 Cal.4th 1111, 1117.) "[A] defendant whose liability is predicated on his status as an aider and abettor need not have intended to encourage or facilitate the particular offense ultimately committed by the perpetrator. His knowledge that an act which is criminal was intended, and his action taken with the intent that the act be encouraged or facilitated, are sufficient to impose liability on him for any reasonably foreseeable offense committed as a consequence by the perpetrator. It is the intent to encourage and bring about conduct that is criminal, not the specific intent that is an element of the target offense, which . . . must

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