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An eight-months-pregnant teenager was strangled to death and her boyfriend decapitated after they agreed to meet an online stranger for sex.

Twisted Brady Oestrike enticed Brooke Slocum and her boyfriend Charles Oppenneer into his home before carrying out the gruesome murders.

Police say the 18-year-old mum-to-be was held hostage after being tied up before being killed and placed in the boot of the killer’s car. Her unborn daughter, Audi Lynn, also died.

Police Chief James Carmody said Oppenneer, 25, was found decapitated in a park a day earlier but said his head still hasn't been found.

(Image: facebook)

The couple vanished on July 12 and after tracing a number of emails between them and the killer police visited his home in Wyoming, Michigan, armed with a search warrant.

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

A SWAT team had been called in to assist in the search for Oestrike as they suspected her was armed with 'assault-style' weapons. It only ended when he fatally shot himself.

Police have confirmed the three met through classified ads website Craigslist.

Emails obtained by investigators show Brooke had spoken to Oestrike, 31, to arrange a sexual encounter in return for cash.

(Image: facebook)

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

Following the gruesome murders Brooke’s father Greg Slocum has 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.

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

(Image: facebook)

“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 Brooke had written letters to her unborn child explaining why she met men for sex saying she just wanted to be loved.