Iowa ? A convicted murderer who escaped from an Iowa prison this week by using a homemade grappling hook to scale a 30-foot limestone wall was captured Thursday in Illinois. A second inmate remained at large.

Martin Moon, 34, was caught after he was found sleeping in a stolen car in the town of Chester, near an Illinois prison. He told investigators he was on his way to Tennessee but gave no reason, authorities said.

Moon and Robert Joseph Legendre, 27, broke out of the Iowa State Penitentiary in Fort Madison on Monday night.

Based on Moon’s account, police believe Moon and Legendre immediately split. A nationwide search was under way for Legendre, who was in prison for attempted murder.

Moon agreed to be returned to Iowa, police said.