Rob Reiner’s troubled son Nick reportedly stormed off in a huff after a tiff with comedy heavyweight Bill Hader at Conan O’Brien’s Christmas party — which left other guests concerned. Reiner, who is accused of slaughtering his filmmaker dad and his mom in their Brentwood home sometime between Saturday night and Sunday afternoon,

Two sources told NBC News that Nick Reiner, 32, had been disruptive at a party, which was hosted by Conan O'Brien, he had attended with parents Rob Reiner and Michele Singer Reiner on Saturday.

Bill Hader and other guests worried the erratic attendee, 6-foot-3 and 230 pounds, had wandered in off the street.

A shaken Bill Hader was spotted anxiously pacing outside his Los Angeles home on what appeared to be a tense phone call after news broke of a squabble he had with Nick Reiner the night before Rob and Michele Reiner’s brutal murder.

Nick Reiner was acting out of place at Conan O'Brien's Christmas party hours before his parents, Rob and Michele Reiner, were found stabbed to death in the couple's home ... and now there's a report of a strange interaction that concerned partygoers.

Hollywood couple's son, Nick Reiner, 32, arrested on suspicion of murder after parents fatally stabbed in their Los Angeles home on Sunday afternoon

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