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Chilling footage shows a sick killer preparing his basement days before he brutally murdered a pregnant 18-year-old and her boyfriend.

Twisted Brady Oestrike enticed Brooke Slocum and her boyfriend Charles Oppenneer into his home after they arranged to meet for sex.

Miss Slocum was eight-months-pregnant when she was strangled to death and her boyfriend was beheaded.

She was kept hostage for five days and repeatedly assaulted, tortured and forced to smoke marijuana.

Horrifying footage - caught on cameras that Oestrike had installed in his home - show that Miss Slocum being tortured before she was strangled to death and dumped in the boot of his car.

Her unborn daughter, Audi Lynn, also died.

(Image: Wyoming Police)

The shocking information has come to light after police released hundreds of pages of documents as well as photos and videos about the grisly incident.

It revealed Oestrike had multiple whips, swords, bondage tools and weapons in his Wyoming house.

There were also nooses with dolls hanging from them, bloody clothes, lingerie, Tasers, a machete and sex toys.

Police also released the footage above, that shows Oestrike preparing his home just before he murdered the pair.

(Image: Facebook)

He is seen holding a gun as he paces around a room that has ropes hanging from the ceiling and a dog cage in the corner.

Through multiple interviews, police uncovered disturbing details about Oestrike, including what one person described as a "fetish for guns."

Police found a number of guns all over his house in Taft Avenue.

The document revealed just how long Miss Slocum was held for after she was kidnapped on July 12, 2014.

She and gone with her boyfriend Oppenneer, to meet a man at Gezon Park to exchange sex for cash.

(Image: Wyoming Police)

On one of four cameras set up in Oestrike's home it shows Miss Slocum with handcuffs on at 1am the following day.

He had put a chain around her neck that was bolted to a bathroom floor.

She was then attached to a pulley system suspended from the ceiling.

The report indicates she was repeatedly assaulted, tortured and forced to smoke marijuana over the next several days, until Oestrike shut off the video system about 1pm on July 17.

After tracing a number of emails between them and the killer police visited his home in Wyoming , Michigan, armed with a search warrant.

(Image: facebook)

(Image: Wyoming Police)

But as officers watched Oestrike’s house he fled leading cops on a chase.

A SWAT team had been called in to assist in the search for Oestrike as they suspected he was armed with 'assault-style' weapons. It only ended when he crashed his car and died.

Emails obtained by investigators show Miss Slocum had spoken to Oestrike - posing under the name 'Hard Mike" - to arrange a sexual encounter in return for cash

She had planned for Mr Oppenneer to meet up with Oestrike and stay present as he had sex with his heavily pregnant girlfriend.

Following the gruesome murders Miss Slocum's father Greg Slocum said he knew about his daughter’s schemes to make money adding she was desperate to do anything her boyfriend insisted on so he would stay with her.

(Image: facebook)

She had recently split with Mr Oppenneer but was desperate to get back together.

“No matter what it took she wanted him back,” said Mr Slocum.

"She paid the ultimate price for it.

“To meet men on Craigslist to make some money because her boyfriend was manipulative she would put herself through hell just to make sure her family didn't get divorced.”

He said he had warned his daughter about meeting strangers for sex.

Before her death Miss Slocum had written letters to her unborn child explaining why she met men for sex saying she just wanted to be loved.