Follow CBSMIAMI.COM: Facebook | Twitter

LOS ANGELES (AP) — Barbara Sinatra, the fourth wife of legendary singer Frank Sinatra and a prominent advocate and philanthropist for abused children, has died at 90.

READ MORE: Small But Ferocious Hurricane Sam Strengthens Some More

John Thoresen, director of the Barbara Sinatra Children’s Center, says she died Tuesday of natural causes at her Rancho Mirage, California, home.

A former model and Las Vegas showgirl, Barbara Sinatra was a prominent Palm Springs socialite in her own right before she married Sinatra in 1976.

READ MORE: Lines Of Mourners Pay Their Respects Sunday For Gabby Petito

They remained wed until his death in 1998.

Together they founded the center that bears her name. The nonprofit has provided therapy to more than 20,000 young victims of physical, sexual and emotional abuse since opening in 1986.

Thoresen says Sinatra remained active at the center until recently, raising funds and visiting with the children.

MORE NEWS: Blue Alert Issued Out Of North Florida County For Patrick McDowell, Accused Of Murdering Deputy During Traffic Stop

(© Copyright 2017 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)