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The ex-wife of one of the DC snipers, John Allen Muhammad, has revealed his last words to her before he embarked on one of the most terrifying killings sprees in US history. Dr Mildred Muhammad, who had three children with John, said she was emotionally and psychologically abused by him over the course of their 12-year marriage. The torment, she said, went on long after the couple split in 1999. She changed her phone number to avoid his stalking, but he still managed to show up at her house. 'He said to me, "You have become my enemy, and as my enemy, I will kill you,"' she told Fox News Digital ahead of a new Investigation Discovery true-crime documentary, 'Hunted by My Husband.' The documentary explores authorities' belief that John was going to eventually kill his wife and make her death look as though it was part of the random murders he was committing. John, an expert rifle marksman, and accomplice Lee Boyd Malvo shot and killed 10 people in the Washington, DC area over a three-week terror campaign in October 2002. Three others were wounded. The duo fired at people through a hole they cut in the trunk of their blue 1990 Chevrolet Caprice, concealing the origin of the shots and allowing them to escape the crime scenes immediately. Over the course of their investigation, which revealed John's role in the attacks, authorities theorized he would soon kill Mildred to gain custody of his three children. Mildred met John in 1985 while he was in the US Army and stationed at Fort Lewis, Washington. They later married in 1988. She said that after he served in Operation Desert Storm in 1990, he was never the same. He was left with a shoulder injury and was diagnosed with post-traumatic stress disorder. 'He would just sit in the corner, rocking back and forth,' she told Fox. 'He no longer wanted to have conversations. Even if I tried to engage, he felt threatened. He was full of rage — but it was a different rage.' 'John was quiet. He was trained in psychological warfare, so he would do things that made me question everything I did. I would look at him and say, "Why are you angry?" He would respond, "Why are you saying I’m angry?" Then he went to the mirror, wiped his hand across his face — and whatever emotion was there was gone.' John would punish her for acting independently by not talking to her for days and hiding her belongings. Mildred eventually learned to stay quiet as he destroyed her self esteem and ability to stand up for herself. 'I tried to reach out for help, but I didn’t have physical scars,' she said. 'I tried to go to my place of religion, and all you’re talking about is that I’m supposed to honor my husband. But how do I honor a man who emotionally hurts me?' After John had multiple affairs, Mildred filed for divorce in 1999, only deepening the conflict between the two of them. After John threatened to kill her, she went into hiding from her ex-husband. A judge then granted a lifetime restraining order, which did not apply to her three children. 'Even though it was for life, visitation was still required every other weekend. We were preparing for court to decide on custody. That’s when he took them,' she said. In 2000, John kidnapped the kids and took them to the Caribbean island of Antigua for 18 months. While there, John met Malvo, the Jamaican teenager with whom he developed a father-son bond. Authorities believe he manipulated the 17-year-old to commit the shootings. Mildred was reunited with her children in 2001 during an emergency custody hearing in Tacoma, Washington. She then moved her family to the Washington, DC area, where John would soon follow. In 2002, as the shootings in DC were still going on, investigators knocked on her door and informed her that her ex-husband was going to be named as the shooter. 'They asked, "Do you think he would do something like that?" I looked up and said, "Yes,"' she recalled. One of the investigators asked Mildred if she knew she was John's target, explaining that two men were shot at places near her residence. She and her children were taken to a hotel. The day after she was informed of John's involvement, he was caught. John was convicted on six counts of first degree murder and was executed by lethal injection on November 10, 2009. Malvo, now 40, was given six consecutive life sentences on November 8, 2006, and remains locked up at Kenn Mountain Correctional Center in Virginia.