Kevin Sweat smuggled a blade into the Okfuskee County Courthouse and pounced after deputies removed his cuffs, authorities say. The confessed murderer wanted to withdraw his guilty plea for slaying two young girls and his fiancee.

Talk about violating the attorney-client privilege.

A deranged killer sliced his lawyer’s neck with a razor just before he was sentenced to life for the murders of two girls and his fiancee, authorities said.

Kevin Sweat, 28, apparently smuggled the blade on Friday into the Okfuskee County Courthouse and attacked one of his two attorneys, opening a small cut on the man’s neck, the county district attorney said at a news conference.

Terrified relatives of Sweat’s victims cowered inside the crowded courtroom as deputies rushed into a side chamber to squash the attack, Fox 23 reported.

“It scared me,” Patricia Taylor, the mother of one of the victims, told reporters. “I thought he might just come in the courtroom and start attacking people.”

Kevin Sweat, center, is escorted in the Okfuskee County Courthouse on Friday, shortly before he allegedly attacked one of his lawyers with a smuggled razor.

Sweat pleaded guilty in July to killing his 23-year-old fiancee, Ashley Taylor, in 2011. He also confessed to shooting 11-year-old Skyla Whitaker and 13-year-old Taylor Paschal-Placker in 2008. The little girls’ bodies were found in a ditch alongside a country road.

Sweat apparently had a change of heart leading up to the sentencing. He called a Fox 25 reporter and said he planned to withdraw his plea, because he’d wanted to meet with FBI agents but didn’t think they were taking him seriously, the station reported.

He claimed he was just waiting for his lawyers to file the paperwork.

The attorneys met Sweat on Friday in a small conference room inside the courthouse to wrap up the final details before sentencing. He was handcuffed and under heavy guard when he arrived, but his law enforcement escorts unlocked the cuffs once he was inside the room, which isn’t uncommon, District Attorney Max Cook told reporters.

The lawyers tried to have a quick meeting alone, and Sweat pounced, Cook said.

“He attacked one of his lawyers and inflicted slight injuries around the neck area,” the prosecutor said.

The skirmish only delayed the inevitable for Sweat, who was strip-searched after the ambush and hauled in front of Judge Lawrence Parish.

“Today is judgment day,” Parish told him.

Patricia Taylor, the mother of murder victim Ashley Taylor, says she was worried her daughter’s killer, Kevin Sweat, was going to burst into the courtroom and ‘start attacking people’ when she heard the commotion.

The judge rejected Sweat’s request to withdraw his plea and sentenced him to three life sentences for the murders without possibility for parole.

The bespeckled killer, wearing a fresh bandage on his nose, stood alongside his remaining lawyer before deputies led him away.

The family and friends of his victims welcomed the sentence but said it wouldn’t change what he’d done.

“No matter what, my daughter’s still gone,” Michael Taylor, father of Ashley Taylor, said. “The pain is always going to be there, and that’s something you can’t take away.”