Police say the murder confession posted yesterday on the image board 4chan was real and matches an active crime scene in Port Orchard, Washington.

The confession thread, posted Tuesday around 2 p.m., was reportedly created before the first 911 call came in and contained images of the deceased woman, Amber Lynn Coplin, naked with red marks around her neck. Her teenage son discovered her body less than an hour later, which the 4chan post had predicted:

Check the news for Port Orchard Washington in a few hours. Her son will be home from school soon. He'll find her, then call the cops. I just wanted to share the pics before they find me. I bought a BB gun that looks realistic enough. When they come, I'll pull it and it will be suicide by cop. I understand the doubts. Just check the fucking news. I have to lose my phone now.

Authorities suspect her boyfriend, 33-year-old David Michael Kalac, killed her on Monday or Tuesday night. Kalac—who texted "Shit is all fucked now. You'll see me in the news," to a friend early Tuesday morning—has been on the run in Coplin's gold Ford Focus ever since, police say.

According to NBC, Kalac was spotted driving Coplin's car in Portland early Wednesday morning but managed to lose police after a brief chase. He is considered armed and dangerous.

Update 12:40 a.m.

Kalac was arrested early Thursday morning after he surrendered to Oregon police.