Jane Fonda recalled Rob Reiner’s final night at Conan O’Brien’s star-studded Christmas party before the filmmaker was stabbed to death.

Nick Reiner -- the son of Rob and Michele Reiner, who's been arrested on suspicion of murdering his parents -- stuck out like a sore thumb at Conan O'Brien 's Christmas party ... and he was acting out...

Rob Reiner’s son Nick Reiner reportedly stormed out of Conan O’Brien’s Christmas party after a tense conversation with actor Bill Hader. The 32-year-old — who has been arrested in connection to his parents’ murders — allegedly interrupted a conversation the comedian was having at the annual bash on Saturday night, a source told NBC News Tuesday.

Director Rob Reiner and his wife, Michele, were found dead in their Los Angeles home in what police called an apparent homicide.

LAPD Chief Jim McDonnell said Nick is a suspect in the case, and announced his arrest on suspicion of murder.