Sarah Ludemann couldn't stop crying.

All through lunch that Tuesday, while the other seniors at Pinellas Park High chattered in the cafeteria, Sarah slumped over a corner table, sobbing.

He did it again, Sarah told her best friend.

Her boyfriend, Josh, kept saying she was the only one. He'd been telling her that the whole time they'd been together. More than a year.

But that day she found out he had been hanging out with his ex — this girl named Rachel.

Read the full story on the stabbing death of a Pinellas Park High School student and listen to audio excerpts of police interviews with Rachel Wade and Josh Camacho, and a voice mail Sarah Ludemann received.