Douglas Shaffer exclusively told Page Six he has “mixed emotions” after the couple’s troubled son was arrested and charged with brutally stabbing his parents to death at their Brentwood, Los Angeles, home on Sunday.

The official narrative isn't just missing pieces--it's shattered by unanswered queries about what the accused killer was doing while his parents lay dead.

Legendary actor and acclaimed director Rob Reiner and his wife, Michele Singer, were tragically found dead on December 14. Shortly after the news broke, LAPD officials announced that the couple's 32-year-old son, Nick Reiner, had been arrested and charged with murder in connection with the pair's gruesome deaths.

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