A Sonoma County Sheriff's deputy shot and killed the mother of his three children on Sunday before fatally shooting himself during a standoff, Santa Rosa Police said on Monday.

Off-duty deputy Jeremy Lyle, 44, allegedly killed his former partner around 7 p.m. while she was at home, Santa Rosa police said. He then knocked on a neighbor's door in the same apartment complex, handed the resident a baby and told them the child's mother was hurt, police said.

The neighbor called 911, and when officers arrived at the Quigg Drive apartment complex, they found a woman unresponsive on her living room couch. Police identified the victim as 38-year-old Mari Bonnici.

Bonnici was a mother of three and a detention specialist with the Sonoma County Sheriff's Office, police said. The infant given to t

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