A California homeowner shot and killed an intruder Saturday to protect her husband, who was busy fighting the suspect off, authorities said. 

Deputies with the Patterson Police Services, a part of the Stanislaus County Sheriff's Office, received a called around 10:20 p.m. about shots fired in the 500 block of Ashwood Lane. The caller said they received a call from a female speaking Mandarian who said she had just shot and killed an intruder. 

Investigators said Angelo Santana, 22, was intoxicated and broke into the home belonging to 50-year-old Yuhui Zheng and her husband, 45-year-old Yang Luan.

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California homeowner kills intruder

A Stanislaus County sheriff's deputy. The department said a homeowner shot and killed an intruder who was fighting with her husband.  (Stanislaus County Sheriff's Office)

Yang Luan attempted to restrain Santana and the pair got into a fight near the front door, authorities said. While the two men were fighting, Yuhui Zheng got a gun from upstairs and opened fire on Santana, Fox San Francisco reported.

Her husband sustained minor injuries. 

Santana was armed but investigators believe the shooting was done in self-defense. No arrests have been made. 

"Other interviews with those familiar with Santana indicate he had a history of alcohol substance abuse, wherein he would regularly show-up unannounced trying to find friends and acquaintances of his in the same neighborhood," the sheriff's department said. 

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The investigation is ongoing and the homeowners are cooperating with detectives, police said.