India, Dec. 15 -- Rob Reiner and his spouse engaged in a "very loud argument" with their troubled son at American late-night talk-show host and comedian Conan O'Brien's Christmas gathering-just hours before authorities stated that they were found dead in their Los Angeles residence, Daily Beast reported, citing insiders.

Nick Reiner, 32, has been taken into custody in relation to his parents' horrific murder, although law enforcement has refrained from asserting that he is the individual who fatally slashed their throats.

Family sources informed TMZ that Rob, 78, and his wife, Michele Singer Reiner, 68, departed the party following the altercation. The timing of Nick's departure remains uncertain.

The couple was found deceased in their...