On Nov. 17, 2017, Harrison stabbed his mother, Joyce Skarka, 53, of Center Moriches, to death in the kitchen of their house, located at 31 Union Ave, Sini said.

Harrison then dragged his mother's body from the kitchen to the bathroom and placed her in the bathtub with her arms folded over her chest before dousing her in gasoline, Sini said.

He also cleaned up the scene of the murder and moved his mother's car from the driveway of the residence to a nearby parking lot to give the appearance that no one was home, Sini said.

Harrison then went to a Suffolk County Police Department substation, where he told police that his mother had attacked him and that she was dead, Sini said.