Lawrence Manley Colburn, a helicopter gunner in the Vietnam War who helped end the slaughter of hundreds of unarmed Vietnamese villagers by U.S. troops at My Lai, has died. He was 67. Lisa Colburn, speaking with The Associated Press on Thursday evening, said her husband of 31 years was diagnosed with cancer in late September and died Tuesday. "It was very quick," she said by phone from her Canton, Georgia, home near Atlanta. "He was a very peaceful man who had a great desire for there to be a peaceful world."