UPDATE:

MALONE, N.Y. (CNN) — A massive, more-than-three-week manhunt for David Sweat ended Sunday as it began, with the escaped murderer in custody.

Authorities said a New York State Police sergeant — identified as Jay Cook — spotted Sweat, and after Sweat ran, the sergeant gave chase.

“At some point, running across a field, he realized that Sweat was going to make it to a tree line, and possibly could have disappeared, and he fired two shots,” New York State Police Superintendent Joseph A. D’Amico told reporters.

Sweat, who was unarmed, was hit twice in the torso.

He was taken into custody in the town of Constable, in upstate New York, very close to the Canadian border.

“I can only assume he was going for the border, that he was that close,” D’Amico said.

Sweat was captured about 16 miles north of the location where fellow escapee Richard Matt was killed last week. The officer was alone when he shot Sweat.

Sweat was transported to the Alice Hyde Medical Center in Malone, an officer at the hospital told CNN. He was later moved to Albany Medical Center, where he was listed in critical condition, according to Dennis McKenna, medical director there.

Emergency, trauma, intensive care, radiology and vascular surgery specialists are involved in his care, McKenna said.

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CONSTABLE, N.Y. (KRON) – A sheriff says the second of two convicted killers who staged an elaborate escape from a maximum-security upstate New York prison three weeks ago has been shot and taken into custody.

Franklin County Sheriff Kevin Mulverhill says David Sweat was shot Sunday afternoon in Constable.

He says Sweat was transported to a medical center in Malone but had no information on his condition.

Fellow inmate Richard Matt was killed in a confrontation with law enforcement officers on Friday.

Authorities say the pair used power tools to saw through a steel cell wall and several steel steam pipes, bashed a hole through a 2-foot-thick brick wall, squirmed through pipes and escaped early June 6 from Clinton Correctional Facility in Dannemora.

Sweat was serving life without parole in the killing of a sheriff’s deputy in Broome County in 2002. Matt was serving 25 years to life for the killing and dismembering of his former boss.