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The lifeless bodies of Rob Reiner and his wife, Michele, were reportedly found in their bed with their throats slit, indicating they had been asleep at the time they were brutally murdered, RadarOnline.com can reveal. The late couple's son, Nick Reiner, was taken into custody on suspicion of murder on Sunday, December 14, hours after the bodies of the beloved Hollywood icon and his spouse were found in their Brentwood, California, mansion. Rob and Michele Reiner's Final Hours. The couple was last seen alive at Conan O'Brien's Christmas party the night before they were found dead. Eyewitnesses claimed Nick was "freaking everyone out" with his behavior at the bash, "acting crazy, kept asking people if they were famous." Rob and his son got into a "very loud argument" at the party, which was boisterous enough that others overheard it, according to TMZ. The outlet reported The Princess Bride director and his wife left shortly thereafter, while it was unclear when Nick departed O'Brien's party. The couple's bodies weren't found until 3:30 pm the following day, when they were discovered by Rob and Michele's daughter, Romy, who called 911. 'At Their Wits End' Over Troubled SonNick battled drug addiction and mental health issues for years, going to rehab 17 times starting at the age of 15. Michele reportedly said, "We’ve tried everything," shortly before her death, when it came to getting their son help, but nothing had worked. "Michele had been anguishing to friends over the last few months that she and Rob were at their wits' end over Nick's mental illness and alleged substance abuse issues," one source told a news outlet. The pair reportedly brought Nick to the former late-night talk show host's party "to keep an eye on him," out of concern. But once they got there, the onetime screenwriter "exhibited antisocial behavior," including staring at other guests. Hotel Shower Was 'Full of Blood' Nick checked into the Pierside Hotel in nearby Santa Monica shortly after allegedly killing his parents, where his disturbing behavior continued, TMZ reported. Although he appeared "tweaked out," Nick didn't show any physical signs of a struggle, according to hotel workers. When housekeeping workers cleaned his room later on Sunday morning, they found the shower "full of blood," with blood stains on the bed and bed sheets covering up a window. Los Angeles Police Department Robbery-Homicide Division detectives later went to the hotel to gather evidence from Nick's room as well as interview hotel staff, after Nick used his own credit card to secure the room. Nick was taken into custody by LAPD officers in Los Angeles' Exposition Park area, about 20 miles away from the hotel, around 9 p.m. local time on Sunday night. The longtime addict was reportedly placed on suicide watch while behind bars at LA's Twin Towers jail, where he's being held without bail. Nick has since retained defense attorney Alan Jackson, who claimed his client isn't medically cleared to appear in court. He was due to make his first court appearance on Tuesday, December 16, where prosecutors planned to determine how to charge the Reiner's son.