Investigators say Nick Reiner was involved in a public altercation hours before the fatal stabbing of his parents.

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

Rob and Michele Reiner attended Conan O'Brien's Christmas party before they were allegedly murdered by their son, Nick Reiner. The comedian and former late-night host hosted the party in his Pacific ...

The night before Rob Reiner and Michele Singer Reiner were murdered, their son Nick Reiner attended Conan O’Brien’s holiday ...

Rob Reiner’s troubled son Nick reportedly stormed off in a huff after a tiff with comedy heavyweight Bill Hader at Conan ...

Rob and Nick attended the party at the late-night talk show host’s home in West Los Angeles on Saturday evening, sources for ...

Besides Rob and Michele Reiner, Nick Reiner reportedly had a heated verbal exchange with comedian, Bill Hader as well during ...

Nick Reiner, the suspect in the killings of director Rob Reiner and his wife Michele Reiner, was reportedly not at home when ...

Jane Fonda posted about seeing Rob Reiner at Conan O'Brien's holiday party before his death -- and she's 'reeling with grief.

Nick Reiner is said to have stormed out of Conan O’Brien’s holiday party after a tense moment with Bill Hader, the night ...

Disturbing details have emerged about Rob Reiner's son Nick's behavior at a star-studded Christmas party he attended with his ...

According to the Los Angeles Police Department, both Rob and Michele were found dead in the home at about 3:40 p.m. Sunday.