Dick Van Dyke's Final Tell-all!

Fading star, 93, dishing on Julie, Andy Griffith & kid brother Jerry

FOLLOWING a final farewell to Hollywood with his role in the new Mary Poppins reboot, beloved comic Dick Van Dyke is penning an explosive memoir to tell all before he dies — with bombshell revelations about his shocking feuds with Andy Griffith and Julie Andrews!

Just recently, the 93-year-old showbiz phenom, now married to second wife Arlene Silver, 47, admitted “the end is coming, sooner rather than later.”

A longtime associate reveals the star of the ’60s sitcom The Dick Van Dyke Show, the ’90s crime drama Diagnosis: Murder and the original Mary Poppins is furiously scribbling away before health woes that he mostly blames on his years of boozing send him to his final curtain call.

“Dick really wants to spill his guts and make a clean breast of it before he goes!” says the source.