One of the two men who escaped from a high-security prison in New York State is now in a hospital. David Sweat was shot when police captured him on Sunday. A hospital official said he is in critical condition.

Hundreds of police officers had searched for David Sweat for 23 days after he escaped. He was captured in a town about 30 kilometers from the prison and three kilometers from the Canadian border. A second man who escaped with him, Richard Matt, was shot and killed Friday.

Sweat killed a sheriff’s deputy in 2002. He had been sentenced to life in prison without the possibility of ever being released.

Investigators believe at least two prison employees helped the men escape. The two have been arrested.