Is there insufficient evidence to support a defendant's claim that he committed the murders and attempted murder in a premeditated manner?

Defendant contends there was insufficient evidence to support the jury's findings that he committed the murders and attempted murder in a premeditated manner. For the three counts of first degree premeditated murder and the single count of attempted premeditated murder, the People were required to prove beyond a reasonable doubt that defendant acted with premeditation and deliberation. ( 189 [defining first degree murder to include "any other kind of willful, deliberate, and premeditated killing"]; 664, subd. (a) [prescribing life sentence for attempted murder that is "willful, deliberate, and premeditated"].) "'"Deliberation" refers to careful weighing of considerations in forming a course of action; "premeditation" means thought over in advance.'" (People v. Sandoval (2015) 62 Cal.4th 394, 424, quoting People v. Koontz (2002) 27 Cal.4th 1041, 1080.) What matters is "'the extent of the [defendant's]

Page 16