Craig F. Walker, a photographer at The Denver Post, today was awarded the Pulitzer Prize for feature photography, the second time he has won journalism’s highest honor in three years.

In “Welcome Home,” Walker chronicled the story of Scott Ostrom, who returned to the United States with a severe case of post-traumatic stress disorder after serving four years as a reconnaissance man and deploying twice to Iraq.

The award was for Walker’s “compassionate chronicle of an honorably discharged veteran, home from Iraq and struggling with a severe case of post-traumatic stress, images that enable viewers to better grasp a national issue,” the Pulitzer board said.

“Scott Ostrum is the one who deserves the credit on this one,” Walker said. “He shared an amazing story with us, and I was honored to be part of it.”

The piece was published online-only on Dec. 30, 2011. Pulitzer judges noted that “digital content played a role” in winning entries, including public service, breaking news reporting, investigative reporting, national reporting, editorial cartooning and breaking news photography.

In 2010, Walker won a Pulitzer Prize for feature photography for his series, “Ian Fisher: American Soldier.”

“Remarkable … This is a great day for The Post,” Denver Post Editor Gregory L. Moore said in an email to the newsroom announcing the award.

Also this year for “Welcome Home,” Walker was named Newspaper Photographer of the Year in the Missouri School of Journalism’s Pictures of the Year International competition. He also won the American Society of News Editors’ community service photojournalism award.

The York, Pa., native, graduated from the Rhode Island School of Photography. He began his career in Massachusetts, at the Marlborough Enterprise. Walker has been with The Post since 1998.