PLYMOUTH, Mich. (AP) — In a 25-minute police video, Alexander James Letkemann told how Daniel Sorensen was set up, stabbed to death in a garage, beheaded and burned.

"J.P. shut the door behind him and went ahead and did it, just did it," Letkemann said. "I don't know why he killed him. I don't know why he had it out for that guy so bad."

J.P. was identified in Friday's preliminary examination in Plymouth District Court as Jean Pierre Orlewicz, 17. He and Letkemann, 18, are accused in Sorensen's Nov. 7 slaying and mutilating his body.

District Judge Michael Gerou ruled there was enough evidence to bind both over for trial in circuit court on first-degree premeditated murder and mutilation of a corpse. Gerou tossed out a second murder charge. Their circuit court arraignment was set for Dec. 14.

The video, taken in a police booking room after Letkemann's arrest, and an eight-page statement he gave police, detailed how the 26-year-old Sorensen was lured to the Canton Township garage on the pretext of extorting $3,000 from another teen.

The ruse included covering the garage floor with a tarp and stocking up on several gallon jugs of Drano to clean up any blood.

Letkemann told police the slaying initially was planned for Tuesday, Nov. 6, but was abruptly canceled after Sorensen was dropped off by a friend at the home owned by Orlewicz' grandfather.

The following day, Sorensen was called back to the garage. He arrived about 5 p.m. in his maroon pickup truck and walked in a side door, Letkemann said.

Once inside, his throat was slashed from behind with a kitchen knife.

Sorensen was stabbed at least 13 times in the garage. He already was dead when his head was cut off with a hand saw, according to the Wayne County medical examiner's office.

A blow torch also was used to burn off his fingerprints in an attempt to conceal the identity of the corpse.

"Dan was dead and there was no one else around," Letkemann said on the police tape, explaining that he began to fear for his life. "For a second I thought (Orlewicz) would come at me, so I didn't want to turn my back on him."

A revolver and car keys were taken from Sorensen's pockets. His body was wrapped in the tarp, tied up with rope and loaded into the back of a pickup. It was driven to an unfinished subdivision in a remote part of Northville Township, where it was dumped along the roadway and set ablaze with gasoline, Letkemann said.

Letkemann told police he later followed Orlewicz to a store parking lot where he dropped off Sorensen's pickup.

Sorensen's head was left overnight in a plastic box in the garage, but dumped the next day in the shallow Rouge River on the Dearborn Heights-Detroit border.

In his statement to police, Letkemann said Orlewicz promised to forgive a $100 debt in exchange for his help.

After questioning by police, Letkemann led investigators to the head the weekend of Nov. 10.

The brutal nature of the slaying and subsequent arrests of Letkemann and Orlewicz led prosecutors to label it a "thrill kill." It stunned many in the adjacent communities of Plymouth and Canton Township where Orlewicz was a senior at Canton High School. Letkemann was a recent graduate of an alternative high school.

Classmates and friends joined their families, and Sorensen's relatives Friday in the small courtroom.

A fidgety Letkemann frequently turned to look at those viewing the proceedings. He occasionally flashed a quick smile at his loved ones.

Orlewicz rarely looked around, but frequently discussed things with his lawyers.

Sorensen's family sat closely in a front row, seeking solace in embraces when testimony and evidence took especially graphic turns, including police photos taken of the burned torso.

As those were projected onto a screen in the courtroom, Letkemann covered his face and looked away. Orlewicz watched with little visible emotion.

Earlier in the day, Isam Ayyash, a friend of the pair, testified that immediately after Sorensen was slain, Orlewicz called and asked his help in disposing the body.

"I asked them if it was a joke, and they said no," said Ayyash, a high school senior who testified to helping lift the body into the bed of a pickup.

"(Orlewicz) asked to borrow my clothing because his was covered in blood," Ayyash said. "I gave him my undershirt and jeans."

Ayyash said Wayne County Assistant Prosecutor Robert Moran offered him immunity as an accessory to a homicide after the fact if he told the truth on the stand.

Sorensen's girlfriend, Breana Milow, 20, testified earlier Friday that he occasionally carried a revolver and a knife and expected to collect $3,000 on the day he was killed.

"It was for his protection," Milow said of the gun. "He used it whenever he went to do a job. I really didn't want to know the details about the job."

Orlewicz' lawyer, James C. Thomas, says his client's ultimate defense is that Sorensen's actions resulted in his death.

Thomas and Raymond Cassar, Letkemann's lawyer, said they could not discuss the case outside of court due to a gag order imposed by Gerou.

The murder charges carry mandatory sentences of life in prison. Mutilating a corpse carries a maximum sentence of 10 years.