Barbara Sinatra Dead at 90

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She was married to one of the country's most iconic singers, Barbara Sinatra has died.

FOX's Michelle Pollino reports:

She was frank Sinatra's fourth and final wife, philanthropist Barbara Sinatra has died at the age of 90.

The woman who stood alongside the crooner gained prominence as "lady blue eyes" and created her own legacy as a premiere battler against child abuse.

She was married to Sinatra for almost 22 years, it was the singer's longest marriage and Barbara used her status and financial access to build the Barbara Sinatra Children's Center to help abused children at Eisenhower Medical Center.

She died Tuesday morning at her Rancho Mirage home after months of declining health.

Michelle Pollino, FOX News.

Follow Michelle Pollino on Twitter: @MichellPollino