New Delhi, Jan. 4 -- HE HATED LYING JOHNNY CARSON & FIGURED SINATRA HELPED KILL MONROE.

RABID funnyman Don Rickles was great pals with showbiz superstars Frank Sinatra and Johnny Carson, but he died feeling bitterly betrayed by both men.

The 90-year-old comedy icon, known as the master of the insult, confessed his rage and disappointment about his late pals shortly before passing on April 6.

"Don died angry at Johnny because he wanted The Tonight Show hosting job - and he was furious at his Rat Pack pal Frank for 'pimping' Marilyn Monroe to his famous buddies, and may have even been involved in her death!" says a correspondent.

Over the years, Don was a star guest on The Tonight Show, leaving the audience in stitches with his insults ...