Massive global merchandising helped him sell millions of records, but by the mid-'70s he was practically driven from the spotlight by a teen market hungry for new talent. He turned to acting for a while, making notable television and stage appearances for many years. His roles even brought him to Broadway and London's West End, where he regained credibility as a dramatic and musical theater actor. He continued this phase of his career into the '90s, when nostalgia and VH1 helped him gain a bigger public spotlight than he had seen in years. He rode that right into a position at the MGM Grand Hotel in 1996, when he opened the 75 million dollar show EFX under much speculation of his drawing power. He revamped several aspects of the production and fine-tuned it until it became one of the biggest attractions in Las Vegas, and his nightly performances became a huge moneymaker for both Cassidy and the hotel. The show garnered many awards, and this gave him the clout to see his Rat Pack Is Back stage show brought to life at the Sahara Hotel & Casino in 1999.
Two other shows, At the Copa and David Inc., opened the next year at the Rio Hotel, but Cassidy had his sights set on returning to the touring circuit with his newfound popularity. He started a world tour in 2001 and even secured a new record deal to release his high-concept stage/music ideas to home audiences. Through the 2000s and beyond, Cassidy made television appearances and continued to tour, until announcing in early 2017 that he had dementia. In November of that year he died in a Fort Lauderdale, Florida area hospital at the age of 67. ~ Bradley Torreano, Rovi