Last month, Marine Staff Sgt. Travis N. "T-Bo" Twiggs went to the White House with a group of Iraq war veterans called the Wounded Warriors Regiment and met the president.

Twiggs had been through four tours in Iraq, one in Afghanistan and months of therapy for post-traumatic stress disorder in which he said he was on up to 12 different medications.

"He said, `Sir, I've served over there many times, and I would serve for you any time,' and he grabbed the president and gave him a big hug," said Kellee Twiggs, his widow.

About two weeks later, Travis Twiggs went absent without leave from his job in Quantico, Va.

He and his brother drove to the Grand Canyon, where their car was found hanging in a tree in what appeared to be a failed attempt to drive into the chasm.

The brothers carjacked a vehicle at the park Monday. Two days later they were at a southwestern Arizona border checkpoint, and took off when they were asked to pull into a secondary inspection area, Border Patrol spokesman Michael Bernacke said.

Eighty miles later, the car was on the Tohono O'odham reservation, its tires wrecked by spike strips.

As tribal police and Border Patrol agents closed in, Twiggs, 36, apparently fatally shot his 38-year-old brother, Willard J. "Will" Twiggs, then killed himself.

Pinal County Sheriff's spokesman Mike Minter said no motive has been established. But Kellee Twiggs said the decorated Marine would still be alive if the military had given him enough help.

"All this violent behavior, him killing his brother, that was not my husband. If the PTSD would have been handled in a correct manner, none of this would have happened," she said in a telephone interview from Stafford, Va.

Travis Twiggs, who enlisted in the Marine Corps in 1993 and held the combat action ribbon, wrote about his efforts to deal with post-traumatic stress disorder in the January issue of the Marine Corps Gazette.

The symptoms would disappear when he began each tour, he said, but came back stronger than ever when he came home.

He wrote that his life began to "spiral downward" after the tour in which two Marines from his platoon died.

"I cannot describe what a leader feels when he does not bring everyone home," he wrote. "To make matters even worse, I arrived at the welcome home site only to find that those two Marines' families were waiting to greet me as well. I remember thinking, 'Why are they here?'"

Weeks later, Twiggs "saw a physician's assistant who said that was the severest case of PTSD she'd seen in her life," his widow said.

He began receiving treatment, but the Marine wrote that he mixed his medications with alcohol and that his symptoms didn't go away until he started his final tour in Iraq.

When he came home, "All of my symptoms were back, and now I was in the process of destroying my family," he wrote. "My only regrets are how I let my command down after they had put so much trust in me and how I let my family down by pushing them away."

Kellee Twiggs said her husband was "very, very different, angry, agitated, isolated and so forth," upon his return. "He was just doing crazy things." Continued...