Frank Sinatra Jr has died at the age of 72, following a massive heart attack. He was the son of Frank and Nancy Sinatra - passed away in a Daytona Beach, Florida, hospital after suffering a massive heart attack. Frank was due to perform a concert of his father's songs at the Peabody Auditorium on Wednesday (16.03.16) night but cancelled after falling ill. He was taken to Halifax Health Medical Center where he later died. The Sinatra family confirmed his death from cardiac arrest. Frank Jr worked for his father as his musical director and conductor, until Sinatra Sr died of a massive heart attack in 1998. Since then, the younger Sinatra has carved out a successful singing career and insisted he was not bitter about never scaling the heights his father did. He previously told news-journalonline.com: ''I think in my generation, when I came along in the early '60s, the type of music that was in vogue in society in those days had moved on to another kind of music. I was trying to sell antiques in a modern appliance store.'' Frank Jr was famously kidnapped in Lake Tahoe in 1963, when he was 19 years old for a ransoM of R3,776,904.00 . He is survived by his son Michael Sinatra and sisters Nancy and Tina Sinatra...