This morning, Gregory Green of suburban Detroit, plead guilty to four counts of second-degree murder in the deaths of his children and stepchildren. Green will be sentenced on March 1st in Wayne County. 

Back in September, Green shot his stepchildren, ages 19 and 17, in front their mother. He also killed his own children, ages 5 and 4, through carbon monoxide poisoning. Green then attacked his ex-wife by shooting her in the feet and cutting her face. His ex-wife survived the attack.

Back in 2008, Green was release from prison. He served 16 years for killing his first wife that was also pregnant.