Nick Reiner was reportedly in an argument with his parents at a Conan O'Brien holiday party the night before they were found ...

This allegation coincides with Nick Reiner's arrest.

The “Being Charlie” co-writer pestered the celebrities with bizarre questions and was eventually asked to leave the comedian’s holiday bash.

Rob and Michele Reiner were wonderful … generous people, always coming up with ideas for how to make the world better, kinder,” the actress wrote.

Celebs Conan O’Brien says Jason Bateman killed his parents — and will strike again "It was so comforting to me to screw around with you guys at that moment … If that makes me a madman, then so be it.” ...

Nick Reiner, 32, has since been arrested in connection with his parents’ grisly slaying, but police have stopped short of saying he is the one who fatally slit their throats. Family sources told TMZ ...

Sources say that Nick Reiner exhibited "antisocial behavior" at Conan O'Brien's holiday party the day before he allegedly killed his parents.

The comedian took comfort in joking around with pals Will Arnett and Jason Bateman after losing his mother and father a year ago.

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