Nick Reiner is aware of he killed his mother and father, Rob and Michele Reiner, however he would not perceive why he is in jail … sources with direct information inform TMZ.

TMZ has a documentary — “TMZ Investigates The Reiner Murders: What Actually Occurred” — airing tonight on FOX and dropping Saturday on Hulu. Our sources say Nick is delusional and believes the individuals who put him behind bars are engaged in a “conspiracy” in opposition to him.

Our sources say Nick’s deadly psychological spiral occurred a couple of month earlier than the murders, when docs modified the meds he was taking for schizoaffective dysfunction — a extreme psychological sickness that causes delusions, hallucinations, and mania. The meds made him more and more harmful and erratic. We’re instructed the meds are nonetheless not working correctly.

We all know Nick’s workforce was continuing down a path of pleading him responsible by purpose of madness. Truth is … that plea doesn’t require proof {that a} defendant like Nick did not know the distinction between proper and improper. The bottom line is whether or not he understood the “character and high quality” of his actions. Even when the murders have been premeditated, it is potential for a jury to succeed in a verdict of not responsible by purpose of madness.