Article continues below advertisementNick Reiner's weight gain and his schizophrenia medications being switched up may have led to him murdering his parents, Rob and Michele Reiner.According to TMZ's new documentary The Reiner Murders: What Really Happened, which aired on Friday, January 9, the 32-year-old drug addict was struggling in the moments before allegedly killing the critically-acclaimed director and his wife on December 14, 2025, at their Los Angeles home.