Richard Overton, the nation's oldest World War II veteran who was also believed to be the oldest living man in the U.S., died Thursday in Texas, a family member said. He was 112.

The Army veteran had been hospitalized with pneumonia but was released on Christmas Eve, said Shirley Overton, whose husband was Richard's cousin and his longtime caretaker.

"They had done all they could," she said.

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He died Thursday evening at a rehab facility in Austin, Texas, she said.

Texas Gov. Greg Abbott issued a statement Thursday calling Overton an "American icon and a Texas legend."

Richard Overton, believed to be America's oldest living veteran, is acknowledged by U.S. President Barack Obama during a ceremony to honor veterans at the Tomb of the Unknowns on Veterans Day at Arlington National Cemetery on November 11, 2013 in Arlington, Virginia. Pool / Getty Images

Overton was born in Bastrop County, Texas and was inducted into the U.S. military on September 3, 1940 at Fort Sam Houston, Texas, CBS Austin affiliate KEYE reports. He served in the all-black 1887th Engineer Aviation Battalion.

Overton was in his 30s when he volunteered for the Army and was at Pearl Harbor just after the Japanese attack in 1941. Overton served in the South Pacific from 1940 through 1945, including stops in Hawaii, Guam, Palau and Iwo Jima during World War II. He left the Army in Oct. 1945, KEYE reports.

Overton worked at local furniture stores before taking a position with the Texas Department of the Treasury - now part of the Texas Comptroller of Public Accounts - in Austin.

He once said that one secret to his long life was smoking cigars and drinking whiskey, which he often was found doing on the porch of his Austin home.

His recent birthdays drew national attention and strangers would stop by his house to meet him. Even well into his 100s, he would drive widows in his neighborhood to church.

"With his quick wit and kind spirit he touched the lives of so many, and I am deeply honored to have known him," Texas Gov. Greg Abbott said in a statement Thursday, calling Overton "an American icon and Texas legend."

"Richard Overton made us proud to be Texans and proud to be Americans," the governor added. "We can never repay Richard Overton for his service to our nation and for his lasting impact on the Lone Star State."

In 2013, former President Obama honored Overton at a Veterans Day ceremony at Arlington National Cemetery.

"He was there at Pearl Harbor, when the battleships were still smoldering," Mr. Obama said of Overton. "He was there at Okinawa. He was there at Iwo Jima, where he said, 'I only got out of there by the grace of God.'"