Diane Whipple, a lacrosse coach, is killed in a dog attack in San Francisco. The resulting court case clarified the meaning of implied malice murder.

Diane Alexis Whipple was an American lacrosse player and college coach. She was killed in a dog attack in San Francisco on January 26, 2001. The dogs involved were two Presa Canarios belonging to Paul Schneider, a high-ranking member of the Aryan Brotherhood serving three life sentences in state prison. The dogs were looked after by Schneider's attorneys, Robert Noel and Marjorie Knoller, a husband and wife who lived in the same apartment building as Whipple. After the fatal attack, the state brought criminal charges against the attorneys. Noel, who was not present during the attack, was convicted of manslaughter. Knoller, who was present, was charged with implied-malice second-degree murder and convicted by the jury. Knoller's murder conviction, an unusual result for an unintended dog attack, was rejected by the trial judge but ultimately upheld. The case clarified the meaning of implied malice murder.

Malice is a legal term which refers to a party's intention to do injury to another party. Malice is either expressed or implied. For example, malice is expressed when there is manifested a deliberate intention to unlawfully take away the life of a human being. Malice is implied when no considerable provocation appears, or when the circumstances attending the killing show an abandoned and malignant heart. Malice, in a legal sense, may be inferred from the evidence and imputed to the defendant, depending on the nature of the case.

January 26 is the 26th day of the year in the Gregorian calendar; 339 days remain until the end of the year.