Bob Kentler is the killer of Javier Gomez, the brother of his son Eric's girlfriend Malia. He killed Javier with a baseball bat in a rage because Kentler was a bigot wanting the couple to breakup, even sending a private investigator to follow them. And Javier tried to get him to back off.
Malia's father Jorge confronted Bob with a gun, so Bob hit him with a shovel and called the family racist names. When he swore to keep Malia and Eric apart, Malia shot him dead. (LA: "Westwood")