SANTA MONICA, Calif. (AP) — Santa Monica police say a gunman has killed himself in a home after a nearly 12-hour standoff.

Lt. Robert Almada says SWAT team members fired tear gas and entered the home at around 4:30 a.m. Wednesday, where they found the man dead of a self-inflicted gunshot wound. Nobody else was hurt.

Police say the 47-year-old man had quarreled with his estranged wife before he took his 15-year-old son and 86-year-old mother-in-law hostage on Tuesday. His wife wasn’t home at the time.

The boy escaped and called 911.

Police surrounded the home at around 5 p.m., evacuated about a square block and tried to convince the man to surrender.

The man’s mother-in-law left the home some five hours later.