Jeff Oh, from Honolulu, will run in his 16th marathon Sunday.
But this one is extra special because of who he's running for, and the marathon's location.
Oh's college classmate and former roommate, Marine Capt. Randy Guzman, was killed in the Oklahoma City bombing.
Guzman was a cross country runner in high school and college, always wanted to run in a marathon, but never got the chance.
In 1995, just after Guzman died, Oh ran in the Honolulu marathon, his first, for his friend. He didn't run in another marathon for 10 years, but when he did, he met a special group of friends.
Now, Oh is part of a 12-person group from all over the United States that meets once a year in a different state for a marathon.
“I mentioned it to one or two individuals in our group that my goal was to come run in Oklahoma for Randy,” Oh said. “Next thing you know, the whole group was on board to come.”
Guzman was one of two victims on the sixth floor of the Murrah Building, along with Marine Sgt. Benjamin Davis.
Oh also ran in the 2010 Marine Corps Marathon in Arlington, Va., in Guzman's memory.
“The marathons are just small gestures for a very dear friend,” Oh said.