Barbara Sinatra, Beloved Philanthropist And Wife Of Legendary Crooner, Dies At 90

RANCHO MIRAGE, CA — Barbara Sinatra, a beloved member of the Coachella Valley community known for her countless charitable efforts, has died. Sinatra — who was the fourth and final wife of legendary crooner Frank Sinatra — passed away Tuesday at her Rancho Mirage home at the age of 90.

The Sinatras' roots ran deep in the California desert community. The duo married at Walter Annenberg's Rancho Mirage estate in 1976. In the 1980s, they raised funds for what would become the Barbara Sinatra Children’s Center on the Eisenhower Medical Center campus, which "... is dedicated to ensuring every child’s right to a normal, healthy and secure childhood" after suffering physical, sexual or emotional abuse, according to the organization's website. The world-renowned center has provided treatment for more than 20,000 children since its inception.

Barbara Sinatra, or "Lady Blue Eyes," was a model and Las Vegas showgirl prior to marrying Frank Sinatra and was married to him longer than any of his other wives. She is survived by her only son, Robert Marx, from her previous marriage to actor-comedian Zeppo Marx, daughter-in-law Hillary Roberts and granddaughter Carina Blakeley Marx.

Last rites were administered by the Rev. Howard Lincoln of Sacred Heart Catholic Church in Palm Desert, who said Sinatra was surrounded by friends and family when she died.

Funeral arrangements will be announced in a few days, according to John E. Thoresen, director of the Barbara Sinatra Children's Center Foundation.

The family requests that memorial gifts be directed to the Barbara Sinatra Center for Abused Children, 39000 Bob Hope Drive, Rancho Mirage, CA, 92270.

Image credit: Michael Buckner / Getty Images Entertainment / Getty Images. City News Service contributed to this report.