And Then There Was One -- Frank Buckles at 107 is the last surviving American WWI Veteran

Harry Richard Landis, who enlisted in the Army in 1918 and was one of only two known surviving U.S. veterans of World War I, has died. He was 108.

Harry Richard Landis, one of only two surviving vets of WWI, died Monday at 108.

Landis, who lived at a Sun City Center nursing home, died Monday, according to Donna Riley, his caregiver for the past five years. He had recently been in the hospital with a fever and low blood pressure, she said.

"He only took vitamins and eye drops, no other medication," Riley said Wednesday. "He was 108 and a healthy man. That's why all of this was sudden and unexpected. He was so full of life."