Nick Reiner believes he is the victim of a conspiracy following the murder of his parents

Nick Reinier knows he killed his parents, Rob And Michelle Reinerbut he doesn’t understand why he’s in jail… sources with direct knowledge tell TMZ.

TMZ has a documentary — “TMZ investigates the Reiner murders: What really happened” – airing tonight on FOX and Saturday on Hulu. Our sources say Nick is delusional and believes the people who put him behind bars are involved in a “conspiracy” against him.

Our sources say that Nick’s fatal mental spiral occurred about a month before the murders, when doctors changed the medications he used it for schizoaffective disorder – a serious mental illness that causes delusions, hallucinations and mania. The drugs made him increasingly dangerous and erratic. We are told the drugs are still not working properly.

We know Nick’s team moved on on the way to find him guilty because of insanity. The fact is… that plea does not require proof that a defendant like Nick didn’t know the difference between right and wrong. The key is whether he understood the “character and quality” of his actions. Even if the murders were premeditated, it is possible that a jury could reach a verdict of not guilty by reason of insanity.