UPDATED EPISODE: When a medical student and military reserve officer disappears during a run through a Philadelphia park, foul play is immediately suspected. The discovery of her body incriminates a deadly serial offender who is finally identified and charged in this special, updated episode of Last Seen Alive.

DECEMBER 2023 UPDATE: On December 20th, 2023, Philadelphia Police charged Elias Diaz, 46, with Rebecca's murder. We have replaced our original episode on her unsolved homicide with an updated episode incorporating the latest available information, as of December 2023.

See photos and our information sources for this episode here.

If you have any information that could lead to additional charges against Diaz, please call 215-686-8477 to report what you know to Philadelphia Police.