Washington, July 4 Ryan O'Neal's son has slammed his estranged father after being denied permission to attend Farrah Fawcett's funeral on June 30.

Ryan and his reformed drug-addict son Griffin had strained their relationship following a row that saw Ryan firing a shotgun into the stairwell of the family home.

Ryan denied entry to Griffin at his partner's memorial service, insisting: "He's a bad guy."

And that left Griffin seeing red.

"I think he's afraid of me because I know the truth about what happened in the later days. He's a dark man and he needs to be put in his place. The reason why I'm not there is because I represent the truth and God forbid the truth coming out," Contactmusic quoted him as saying.

Speaking outside the service, Griffin apparently added: "She's mad I'm not in there."

Charlie's Angels star Fawcett died last month, after losing her three-year battle to cancer. (ANI)