Lisa Colburn told the Associated Press on Thursday evening that 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 home in Canton, Ga., near Atlanta. "He was a very peaceful man who had a great desire for there to be a peaceful world."

She also called him "a compassionate person who was a hero in many people's eyes."

Colburn was the last surviving member of a U.S. Army crew that ended the My Lai massacre of March 16, 1968. According to accounts, pilot Hugh Thompson landed the helicopter between unarmed villagers and American troops and ordered Colburn and crew chief Glenn Andreotta to cover him.

Thompson then persuaded members of Charlie Company to stop shooting. The company's soldiers had begun shooting villagers that day even though they hadn't come under attack, authorities later said. The shooting quickly escalated into an orgy of killing that claimed the lives of as many as 504 civilians — mostly women, children and the elderly.

In an initial Facebook post, Lisa Colburn confirmed her husband’s death and wrote: "As most of you know, Larry has been very ill for a while but his suffering ended today, 12/13/16/." She added: "Your friendship meant a lot to him."

Trent Angers, who wrote a biography of Thompson, "The Forgotten Hero of My Lai: The Hugh Thompson Story," said Colburn played an indispensable role in stopping the massacre at My Lai.

"He stood up, shoulder to shoulder with Hugh and Glenn, to oppose and stand down against those who were committing crimes against humanity. Without his assistance, Hugh might not have done what he did," Angers said.

Colburn and Thompson were nominated for the Nobel Peace Prize in 2001 for their actions and received the Soldier's Medal, the highest U.S. military award for bravery not involving conflict with the enemy.

Thompson, who lived in Lafayette, La., died in 2006. Andreotta was killed in combat in Vietnam three weeks after My Lai.

A memorial service for Colburn is planned Jan. 7. In addition to his wife and son, he is survived by three sisters.

The Associated Press - December 17,2016