Frank Sinatra Jr. Dies at 72: Tony Bennett, Seth MacFarlane and Other Stars Share Heartfelt Tributes

Frank Sinatra Jr. died of cardiac arrest on Wednesday at the Halifax Health Medical Center in Daytona Beach, Florida at the age of 72, the AP reports. In the wake of his death, fans and friends have been taking to social media to share their condolences for the celebrated singer.

A number of stars who knew and worked with the celebrated singer -- who was the son of iconic crooner Frank Sinatra and his former wife, Nancy Barbato, as well as the younger brother of "These Boots Are Made for Walkin'" singer Nancy Sinatra -- honored his memory with kind words and sentiments.

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Family Guy creator Seth MacFarlane, who worked with Sinatra Jr. on the popular Fox animated sitcom, shared a heartfelt message, writing, "Frank Sinatra, Jr. was a friend to Family Guy, and a friend to me. I'm saddened at his passing, but grateful to have known him. RIP, Frank."

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Music legend Tony Bennett also paid tribute, writing, "I am deeply saddened to hear of the passing of Frank Sinatra Jr and send my sympathy to Tina and Nancy and the Sinatra family."

Actress Mia Farrow -- who was married to Sinatra Jr.'s father from 1966 to 1968, 15 years after his marriage to Nancy ended in divorce, wrote, "RIP Frank Sinatra Jr. Thoughts with his mother Nancy, sisters Nancy and Tina and his son Michael.

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Deanna Martin, daughter of Rat Pack crooner Dean Martin, expressed her sadness at Sinatra Jr.'s unexpected passing, telling ET, "I am shocked and devastated at the loss of my lifelong friend Frank Sinatra Jr. He was a brilliant musician, both as a singer and a conductor. He was my Pallie… one of the good guys. My thoughts and prayers are with his loving family."

Numerous other stars also paid tribute in the hours following Sinatra Jr.'s passing.