What is the test for a jury to convict a defendant of manslaughter based on the testimony of a single witness?

(People v. Little (2004) 115 Cal.App.4th 766, 771.) The testimony of a single witness, if believed by the jury, is sufficient to support a conviction, unless that testimony is physically impossible or inherently improbable. (People v. Young (2005) 34 Cal.4th 1149, 1181.) " '[T]he relevant question is whether, after viewing the evidence in the light most favorable to the prosecution, any rational trier of fact could have found the essential elements of the crime beyond a reasonable doubt.' " (People v. Hatch (2000) 22 Cal.4th 260, 272, italics omitted.)

B. Distinctions Between Murder and Voluntary Manslaughter

1. Introduction

California law separates criminal homicide into two classes, "the greater offense of murder and the lesser included offense of manslaughter." (People v. Rios (2000) 23 Cal.4th 450, 460 (Rios).) "The distinguishing feature is that murder includes, but manslaughter lacks, the element of malice." (Ibid.)