What is relevant evidence in a murder trial?

Only relevant evidence is admissible. (Evid. Code, 350.) Evidence that raises a reasonable doubt as to a defendant's guilt, including evidence tending to show that another person committed the crime, is relevant. But evidence that another person had a motive or opportunity to commit the crime, without more, is irrelevant because it does not raise a reasonable doubt about a defendant's guilt; to be relevant, the evidence must link this third person to the actual commission of the crime. (See People v. Avila (2006) 38 Cal.4th 491, 577-578.) Evidence that is relevant still may be excluded if it creates a substantial danger of prejudicing, confusing, or misleading the jury, or would consume an undue amount of time. (See Evid. Code, 352.)