
Sara Tancredi is not really dead
No, ; her death in Season 3 was faked as a plot device and she remains alive through the end of the series. The Faked Death (Season 3)
If you are a new viewer binge-watching Prison Break for the first time, and you just saw the "head in the box" scene, do not despair. Fast-forward through the grief. By the first episode of Season 4, Dr. Sara Tancredi is back, stitching wounds, and rolling her eyes at Michael’s tattoos.
Prison Break: Why Sarah Wayne Callies Wasn't In Season 3, Explained

