Frank Sinatra Jr., son of the legendary singer and actor, died suddenly Wednesday in Daytona Beach, Florida, where he was performing in a musical tribute to his father.
The Associated Press reported that he had a heart attack and was 72 years old.
Sinatra was a singer and musician who made headlines in 1963 when he was kidnapped and released after his father paid a large ransom.
Gossip columnists said the kidnapping was a hoax and publicity stunt, but the FBI said it was genuine and the kidnappers were convicted.
While Sinatra could never come close to matching the fame and artistry of his father, he did become well-known as the musical director and conductor for the senior Sinatra's concerts.