WALNUT PARK (CBS) — A Walnut Park man has been arrested in the shooting death of his estranged wife, authorities said Monday.

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Julio Ramon Solano allegedly shot his wife at a home in the 2800 block of Olive Street at 8 p.m. Sunday, according to the Los Angeles County Sheriff’s Department.

Solano, 34, and his wife were reportedly arguing over custody of their children, ages 6 and 11, when the shooting occurred, officials said.

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“I was watching TV and suddenly I heard three gunshots. I went outside and I saw the victim walking towards the white truck and she collapsed,” neighbor Evelyn Tinoco said.

The woman, who was shot in the upper torso, later died at a hospital.

Solano reportedly fled the scene following the shooting, but later returned and was arrested by deputies around 3 a.m., officials said.

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The children were not harmed in the incident and have been placed with the Los Angeles County Department of Children and Family Services.