Early Tuesday morning, police found 5-year-old Sofia Murphy, 7-year-old Noah Murphy and their father Jefferson Murphy at their home with apparent stab wounds. In March 2017, the teen was arrested for setting the family auto on fire at a Cracker Barrel restaurant.
Malik Murphy told police he often had "homicidal ideations" and planned to kill his family and bury them in the backyard so he could be alone at the home.
Police spoke with Murphy briefly before arresting him, authorities said.
The 19-year-old, Malik Vincent Murphy, has been arrested on suspicion of first-degree murder.
The rear of the vehicle was fully engulfed when firefighters arrived on scene and proceeded to burn forward as they brought the fire under control, according to a March 31 report by the Effingham Daily News.
Murphy was the driver and sole occupant, and the vehicle was owned by his parents, Effingham Police Chief Jeff Fuesting said.
"We have a 19-year-old kid with no criminal history from four states over who clearly has mental health issues", Kibler said. They said this appears to be an isolated incident, and there is no threat to the public. According to those documents, Murphy's father told police that Malik had "talked about doing this previously". "I've seen it several times". His office could theoretically reopen the case, but with Miller facing an extended time in custody, Kibler does not expect to reopen the case.