Delores Jackson, the ex-wife of Michael Jackson's brother Tito, accidentally drowned in a swimming pool while visiting the Ladera Heights home of her boyfriend, the Los Angeles County Sheriff's Department reported.

Jackson, 39, had been swimming with her boyfriend, Donald Bohana, 58, at his home on Holt Avenue about 4 a.m. Saturday. Bohana got out of the pool and left briefly. When he returned, he found Jackson at the bottom of the pool, Sheriff's Deputy Rich Erickson said.

Erickson said Bohana pulled Jackson from the water and called 911. Deputies did not know how long she had been in the water.

Jackson was taken by ambulance to Daniel Freeman Memorial Hospital in Inglewood, where she was pronounced dead.

"Investigators believe Jackson died from accidental drowning, but the exact cause of death will be determined by the medical examiner," Erickson said.

Delores Jackson divorced Tito Jackson in 1988 after 16 years of marriage.