Law enforcement ended a three-week manhunt for convicted killers David Sweat and Richard Matt, who escaped Clinton Correctional Facility, in New York on June 6, 2015 after killing Matt and capturing Sweat.

Matt was shot and killed by the U.S. Border Patrol tactical unit in Malone, New York on June 26, 2015 and David Sweat was finally taken into custody June 28, 2015. The U.S. Marshals Service had both killers on the "15 Most Wanted" fugitives list.

Here, escaped convict David Sweat is given first aid upon his capture after being shot, June 28, 2015 in Constable, New York.

Police stand over David Sweat after he was shot and captured near the Canadian border Sunday, June 28, 2015, in Constable, New York.

Sweat and Richard Matt staged a brazen escape three weeks ago from a maximum-security prison, Clinton Correctional Facility, in northern New York. His capture came two days after his escape partner, Richard Matt, was shot and killed by authorities.

FBI agents conduct a search for convicted murderer David Sweat on June 28, 2015 near Duane, New York. On Friday Richard Matt, who escaped with Sweat, was shot and killed in the same area.

More than 1,000 State Police, Border Patrol, correction officers, FBI and other law enforcement agencies had searched for the pair since they were discovered missing.

A sign at the Constable Volunteer Fire and EMS thanks law enforcement after the second of two escaped prisoners, David Sweat, was apprehended on Sunday, June 28, 2015, in Constable, New York.

David Sweat, the second of two convicted murderers who staged a brazen escape three weeks ago from a maximum-security prison in northern New York, was shot and captured near the Canadian border on Sunday, June 28, 2015, two days after his fellow inmate was killed in a confrontation with law enforcement officers, a sheriff said.

FBI agents conduct a search for convicted murderer David Sweat on June 28, 2015 near Duane, New York.

On Friday June 26, 2015, Richard Matt, who escaped with Sweat, was shot and killed in the same area.

Law enforcement officers search a residential area for an David Sweat in Malone, New York, June 28, 2015.

Law enforcement teams battled driving rain in upstate New York on Sunday June 28, 2015 in their manhunt for Sweat, who escaped from a maximum security prison.

A law enforcement officer checks a vehicle at a roadblock along County Route 41 during a search for escaped prisoner David Sweat south of Malone, New York on June 27, 2015.

Morning strategy meeting at the Titus Mountain Ski Area in the town of Malone as search efforts continue June 27, 2015 for Clinton Correctional Facility escapee David Sweat.

New York State Police officer Maj. Charles Guess holds a press conference to brief the media on the status of the manhunt for the convicted murderers, June 26, 2015 in Malone, New York explaining that Richard Matt was shot and killed by a Border Patrol agent in a wooded area about 30 miles from the prison while the manhunt for Sweat continues.

Law enforcement personnel search for convicted murderers Richard Matt and David Sweat on June 26, 2015 in Chasm Falls, New York, before Matt was shot and killed by the U.S. Border Patrol tactical unit.

A correction officer searches outbuildings on a farm as the manhunt for convicted murderers Richard Matt and David Sweat continued, June 26, 2015, in Chasm Falls, New York before Matt was shot and killed.

Correction officers search outbuildings on a farm as the manhunt for convicted murderers Richard Matt and David Sweat continued on June 26, 2015 in Chasm Falls, New York before Matt was shot and killed by the U.S. Border Patrol tactical unit. The search for Sweat continues.

Correction officers search a wooded area for convicted murderers Richard Matt and David Sweat on June 26, 2015 in Chasm Falls, New York. Matt was shot and killed by the U.S. Border Patrol tactical unit. The search for Sweat continues.

Law enforcement personnel prepare to head out on a search for convicted murderers Richard Matt and David Sweat on June 26, 2015 in Chasm Falls, New York. Matt was shot and killed by the U.S. Border Patrol tactical unit. The search for Sweat continues.

Law enforcement personnel prepare to head out on a search for convicted murderers Richard Matt and David Sweat in Chasm Falls, New York, June 26, 2015. Matt was shot and killed by the U.S. Border Patrol tactical unit in Malone, New York later that day, but the search for Sweat continues.

Correction officers search around a home as the manhunt for convicted murderers Richard Matt and David Sweat continued in Chasm Falls, New York, June 26, 2015. Matt was shot and killed by the U.S. Border Patrol tactical unit in Malone, New York, but the search for Sweat continues.

New York State officers stand guard near the site where one of two convicted murderers that escaped from an upstate maximum-security prison, Richard Matt, was shot and killed, Friday, June 26, 2015.

Correction officers search around a home as the manhunt for convicted murderers Richard Matt and David Sweat continued on June 26, 2015 in Chasm Falls, New York. Matt was shot and killed by the U.S. Border Patrol tactical unit in Malone, New York, but the search for Sweat continues.

Corrections officers fan out across a field as the manhunt for convicted murderers Richard Matt and David Sweat continued on June 24, 2015 in Malone, New York.

Correction officers search around a home as the manhunt for convicted murderers Richard Matt and David Sweat continued on June 26, 2015 in Chasm Falls, New York.

Correction officers search around a home as the manhunt for convicted murderers Richard Matt and David Sweat continued on June 26, 2015 in Chasm Falls, New York.

Law enforcement personnel search a wooded area after receiving a tip that convicted murderers Richard Matt and David Sweat were in the Mountain View, New York area on June 24, 2015.

Law enforcement personnel search a wooded area after they received a tip that convicted murderers Richard Matt and David Sweat were in the area on June 24, 2015 in Mountain View, New York.

DNA from the two was reportedly found recently in a remote hunting cabin about 15 miles west of the prison.

Law enforcement personnel search a wooded area after they received a tip that convicted murderers Richard Matt and David Sweat were in the area on June 24, 2015 in Mountain View, New York.

DNA from the two was reportedly found recently in a remote hunting cabin about 15 miles west of the prison.

Prison guard Gene Palmer, seen in this New York State Police photo, was arrested June 24, 2015 on charges he may have unknowingly helped Sweat and Matt escape from Clinton Correctional Facility in Dannemora, New York.

Palmer is charged with delivering tools to David Sweat and Richard Matt, that they used to break out of their maximum security prison in northern New York on June 6, 2015.

New York State Department of Corrections officers search the railroad tracks on Sunday, June 21, 2015 after a possible sighting of the two escaped killers in Friendship, New York.

State police said a woman reported spotting two men who resembled the convicts near a railroad line that runs along a county road, June 20, 2015.

Photos of Richard Matt (L) and David Sweat (R) who escaped from the Clinton Correctional Facility in the dead of night, June 6, 2015.

Matt was in prison, serving 25 years to life, for the kidnapping and murder of a man in 1997. Sweat was serving a life sentence with no opportunity for parole for the murder of a Broome County sheriff's deputy in 2002.

Joyce Mitchell, a prison worker who allegedly helped two convicts escape from prison, is lead from Plattsburgh City Court after a hearing on June 15, 2015 in Plattsburgh, New York.

Clinton County District Attorney Andrew Wylie speaks to the media after a hearing for Joyce Mitchell, a prison worker who allegedly helped two convicts escape from prison, outside Plattsburgh City Court on June 15, 2015 in Plattsburgh, New York.

Law enforcement officers question a woman on June 10, 2015, who lives near the prison in Dannemora, New York.

Police search houses near the Clinton Correctional Facility in northern New York, where two killers escaped using power tools.

Law enforcement agents ride all-terrain vehicles during a search of a wooded area near Cadyville, New York, June 12, 2015.

Joyce Mitchell (L), the prison worker suspected of having smuggled contraband into the prison where convicts Richard Matt and David Sweat were incarcerated, is arraigned in City Court in Plattsburgh, New York, June 12, 2015.

Prison worker Joyce Mitchell is seen in a photo provided by the New York State Police.

Law enforcement officers look out over a field near Willsboro, New York on June 9, 2015.

The tattoos of escaped prisoners Richard Matt (top) and David Sweat in a combination of undated photos released by the New York State Police in Ray Brook, New York.

A manhole used by two prisoners who escaped the Clinton Correctional Facility is seen in Dannemora, New York, June 13, 2015.

A task force of U.S. Marshals and police officers go door to door searching for two escaped convicts on June 16, 2015 outside Dannemora, New York.

The two convicted killers, Richard Matt and David Sweat, escaped from Clinton Correctional Facility in Dannemora, New York, June 6, 2015.

Vermont Governor Peter Shumlin (L) and New York Governor Andrew Cuomo take part in a news conference at the Clinton Correctional Facility in Dannemora, New York on June 10, 2015.

The manhunt for two inmates who escaped from a New York state maximum security prison expanded to neighboring Vermont on June 10 as the pair set a record for the longest jailbreak in New York history, authorities said.

Law enforcement personnel search an area in Saranac, New York, June 14, 2015.

A handout photo from the New York State Governor's Office, shows a note saying "Have A Nice Day!" left behind by Richard Matt and David Sweat, where the two convicted murderers used power tools to cut through steel pipes at the Clinton Correctional Facility in Dannemora, New York on June 6, 2015

Matt, 48, and Sweat, 34, escaped from the maximum security prison June 6, 2015 using power tools and going through a manhole.

A handout photo from the New York State Governor's Office, shows where two convicted murderers used power tools to cut through steel pipes at the Clinton Correctional Facility on June 6, 2014 in Dannemora, New York.

A law enforcement officer works a checkpoint in West Plattsburgh, New York, June 14, 2015.

A guard stands on the wall at Clinton Correctional Facility in Dannemora, New York, June 8, 2015.

A handout photo from the New York State Governor's Office, shows where two convicted murderers escaped from the Clinton Correctional Facility in Dannemora, New York, June 6, 2015.

New York Governor Andrew Cuomo (R) looks at the manhole believed to have been used by escaped convicts near the Clinton Correctional Facility in Dannemora, New York, on June 6, 2015.

More than 200 local, state and federal law enforcement officials set up roadblocks, took to the air and went door-to-door in their search for Richard Matt, 48, and David Sweat, 34, who went missing in the dead of night on June 6, 2015 from the Clinton Correctional Facility, located about 20 miles south of the Canadian border.

A hole in the wall of a prison cell is visible at the Clinton Correctional Facility in Dannemora, New York, June 6, 2015.

Police officers search a property near the Clinton Correctional Facility in Dannemora, New York, June 8, 2015.

A guard stands in a tower at the Clinton Correctional Facility in Dannemora, New York, June 8, 2015.