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GRAPHIC: Photo of dead escaped prisoner Richard Matt surfaces

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GRAPHIC WARNING — In this photo obtained by CNN, escaped Clinton Correctional Facility inmate Richard Matt is shown after he was shot and killed by law enforcement on June 26, 2015.  Scroll down to see the pic.

David Sweat claims relationship with breakout partner soured, official says

After convicted murderers David Sweat and Richard Matt pulled off their brazen escape from an upstate New York prison, their relationship quickly began to sour, according to a law enforcement official briefed on Sweat’s interviews with investigators.

Sweat has told investigators that Matt, who was fatally shot last week, was out of shape and unable to keep up with the younger man, the law enforcement official told CNN on Wednesday.

In particular, Sweat told investigators, he was irked that Matt got drunk after the men broke into a cabin, the official said. The discord prompted the fugitives to split up.

After a border patrol agent caught up with and killed Matt last Friday, authorities said officers could smell alcohol on his body from a few feet away, according to a law enforcement source briefed on the investigation.

From his hospital bed in Albany, New York, Sweat has been revealing details about the prison break that seems to baffle almost everyone — except himself.

Sweat and Matt pulled off the sensational escape not once, but twice, the inmate has told investigators.

Through it all, Sweat was the mastermind — or at least that’s what he’s telling authorities, a local district attorney said.

And while authorities initially spoke of the possible use of power tools in the escape, Sweat has said that he and Matt actually found a sledgehammer in an underground passageway. It was probably left behind inadvertently by a construction worker, according to the law enforcement official briefed on his interviews.

The men supposedly used the sledgehammer to break down a brick wall on their way out of the maximum-security prison, the official said.

An escape before the escape

Sweat said the plot to break out of Clinton Correctional Facility actually started in January, Clinton County District Attorney Andrew Wylie told CNN.

After five months of strategizing, Sweat and Matt made a practice run.

One night before prison tailor Joyce Mitchell was supposed to meet them at a manhole, Sweat and Matt escaped from their cells, a New York state official said.

They navigated a maze of tunnels and pipes before popping out of a manhole. But Sweat said they saw too many houses near that manhole and decided to try for another manhole the next night, Wylie told NBC News.

“To make a dry run and … have the ability to escape, and then go back in, it is a little baffling,” he said.

So why didn’t the guards notice? It’s not clear, but the state Inspector General’s Office has been looking into whether guards had fallen asleep, officials told CNN.

GRAPHIC WARNING -- In this photo obtained by CNN, escaped Clinton Correctional Facility inmate Richard Matt is shown after he was shot and killed by law enforcement on June 26, 2015.

GRAPHIC WARNING — In this photo obtained by CNN, escaped Clinton Correctional Facility inmate Richard Matt is shown after he was shot and killed by law enforcement on June 26, 2015.

Just hacksaws

After rampant speculation over what power tools the pair used, Sweat told investigators that he and Matt used only hacksaws to cut through their cell walls and a steam pipe inside the prison, the district attorney told CNN.

After interviewing Sweat for several hours over the last two days, New York State Police investigators had no plans for now to speak with him further, State Police spokesman Beau Duffy said.

Duffy did not have information on where Sweat will go once released from Albany Medical Center but said he will be turned over to the corrections department. Sweat is listed in fair condition and is expected to remain at Albany Medical Center for at least a few days, according to the hospital.

Sweat is in a jail-like section of the hospital, where there are at least two guards for each of the eight to 10 prisoners, said Dr. Dennis McKenna, the hospital’s medical director.

Mitchell, the prison tailor, has admitted to smuggling hacksaw blades by hiding them in frozen hamburger meat and then having the meat delivered to Matt, a law enforcement official said last week.

She has been arrested and charged with promoting prison contraband and criminal facilitation.

Another employee, Gene Palmer, is accused of taking the meat to the inmates. He’s charged with promoting dangerous prison contraband, two counts of destroying evidence and one count of official misconduct.

A dozen prison employees put on leave

But the investigation extends far beyond Mitchell and Palmer — and well beyond the escape.

Three members of the prison’s executive team, along with nine security staff employees, have been placed on paid administrative leave as part of the review of the escape, said the New York State Department of Corrections and Community Supervision.

Superintendent Steven Racette and Deputy Superintendent Stephen Brown are among the executives on leave, a state official told CNN on Tuesday. The other is First Deputy Superintendent Donald Quinn, according to a source familiar with the investigation.

And the FBI is investigating possible broader corruption at the prison, law enforcement officials briefed on the case said. Agents are looking into whether drug trafficking or other criminal behavior among employees and inmates took place, officials said.

Some employees who have been questioned told investigators that there was heroin use among prisoners and an alleged drug trade involving employees.

How the plan derailed

According to Sweat, officials said, this is how the plan was supposed to play out:

Sweat and Matt would come out of a manhole and meet Mitchell, who would drive them away. The convicted murderers would then kill Mitchell’s husband, Lyle, before fleeing to Mexico.

But Mitchell never showed up, forcing the fugitives to improvise on the run for more than three weeks. The two split up along the way, apparently because Sweat thought his older, less athletic partner was slowing him down, New York Gov. Andrew Cuomo said.

Police caught up with and killed Matt last Friday. Two days later, an officer shot and wounded Sweat less than 2 miles from the Canadian border.

Matt’s family will not be claiming his body, so authorities in Franklin County, New York, will handle the burial, said Megan Avery at the Alice Hyde Medical Center in Malone. The body was at the medical center’s morgue, and authorities could claim it as soon as Wednesday, Avery said.

Mitchell’s husband ‘still in love with her’

Never mind that Sweat, Matt and Mitchell allegedly planned to have Mitchell’s husband killed before they drove off to Mexico. Lyle Mitchell still loves his wife.

After all, Joyce Mitchell bailed on the plan to serve as the escapees’ getaway driver, Lyle Mitchell’s attorney told CNN.

“In a way, he’s looking at it like Joyce saved his life that night by not picking them up,” attorney Peter Dumas said.

“He’s still in love with her, to put it bluntly. And I think he plans on waiting for her.”

By Holly Yan, Ray Sanchez and Evan Perez

Ashley Fantz, Shimon Prokupecz, Danelle Garcia, Deborah Feyerick, Don Lemon, Anderson Cooper, Carolyn Sung, Jean Casarez and Alexandra Field contributed to this report.