Gregory Green, 49, called police to say he murdered his family and waited on their front porch to surrender. It is believed that he went on a rampage, fueled by his belief that his wife Faith Green, 39, was cheating on him. He allegedy forced her to watch as he shot and killed his two step-children, 17-year-old Kara Allen and 19-year-old Chadney Allen, execution style in the basement. Police say he killed their two youngest daughters, 4-year-old Kaleigh Green and 6-year-old Koi Green, by putting them inside a car and manipulating the tail pipe to fill the vehicle with exhaust fumes. According to records, Green was convicted of second-degree murder in the stabbing death of his then six months pregnant pregnant wife in March 1992. After that murder, he called police to tell them when he had done and waited for them to arrive. He served 16 years in prison, getting just one fighting ticket in 2002 when he fought another inmate over a television. He was denied parole four times for various reasons, but it was centered around his lack of remorse for the crime. After taking some cognitive-based programs, he was given parole in 2008 and discharged in April 2010. Green then married Faith Green who is recovering from a gunshot wound.