Brooke Slocum, 18, and her boyfriend Charles Oppenneer, 25, were murdered by 31-year-old Brady Oestrike, whom they connected with on Craigslist for a sexual encounter.

Wyoming, Michigan police chief James Carmody said the teen was held captive by Oestrike before being strangled. She was eight months pregnant. Her boyfriend was found beheaded in a park one day earlier, and his head has yet to be found.

Emails indicate that Slocum connected with Oestrike on Craigslist to arrange a sexual encounter, where Oppenneer would be present. Carmody says it's been a "hellish environment" for officers investigating the various crime scenes, including the alleged killer's home, where they found firearms, ammunition, and knives. 

Oestrike killed himself after crashing his car while fleeing from police. 

Source: huffingtonpost.com