The Rose Tattoo Killer

My name is Markus DeSaints, and I'm a serial killer. The police, along with a determined detective, have found all of the evidence...and the bodies. Now I'm stuck in county jail until my trial, waiting to hear if I get the death penalty or if I'm going to waste away in jail for the rest of my life. However, I wasn't expecting them to send me to Mercy Hall, the local asylum. Those who enter Mercy Hall's doors, don't usually come back out.
Soon, I'm put in front of a panel and asked to retell my killings. Will they believe the detective's story to the public? Or will they believe the words of a killer once I reveal what I've been keeping from the police?