There is new information about a possible motive behind a local murder. Court documents show that Justin Slater, the man charged with killing his brother, told his father quote "he knew one person had to die."

That's according to a search warrant for Gregory Scott Slater's Frederick County Home. The documents confirm that Justin Slater told his father that his brother was trying to quote "get together with Kayleigh." He's referring to Kayleigh Plamondon, his ex-girlfriend. The search warrant also states that Justin Slater was suicidal because of a recent breakup with Kayleigh Plamondon.

June 3rd Slater was taken to the hospital for a mental evaluation. When he left the hospital, Justin Slater's father says his son told him he was better and that he knew only one person had to die.

There is also a search warrant for Justin Slater's parent's former home on Timberline Drive in Hardy County, West Virginia. It states after Slater was arrested he was asked about Kayleigh Plamondon and said she was at the house on Timberline Drive and was dead. The search warrant states that Slater told Clarke County Sergeant Travis Sumption that he killed Plamondon in Clarke County on June 9th and took her body to the house in Hardy County, West Virginia on the same day. That's two days before the day police say Slater shot and killed his brother.

Police are still waiting on autopsy results on the body found in Hardy County. Currently Slater is charged with first degree murder and other firearms charges in Frederick County. He will appear in court in West Virginia Tuesday morning for an extradition hearing. An autopsy on Gregory Slater confirms he was killed by a shotgun wound to the head.