Rickles and Sinatra maintained a strong friendship, and Rickles was often seen in the company of The Rat Pack.
After becoming frustrated with how little acting work he was getting, Rickles began doing stand-up comedy.
According to Variety, legendary actor and comedian Don Rickles, known for his biting insults, has passed away today from what appears to be kidney failure.
The two even performed together at President Ronald Reagan’s second inauguration, which Rickles called the highlight of his career.