LOS ANGELES — The mayor of Bell Gardens, Calif., was shot and killed by his wife during a domestic dispute in their home Tuesday, law enforcement officials said.

Mayor Daniel Crespo and his wife, Lyvette Crespo, were involved in an argument on Tuesday afternoon, when their 19-year-old son tried to intervene, Nicole Nishida, a spokeswoman for the Los Angeles Sheriff’s Department, said.

The fight between Mr. Crespo and his son, Daniel Crespo Jr., soon turned physical, and Ms. Crespo produced a gun and fired, striking the mayor multiple times in the torso, Ms. Nishida said.

Mr. Crespo, 45, was pronounced dead at a hospital. Ms. Crespo, 43, was taken into custody by the police.