Sara Tancredi was a doctor, who worked in Fox River. After helping to break Lincoln Burrows out, Sara was captured. Later she was free and escaped and killed a few people. Sara was first responsible for the deaths of 2 Sona inmates: Theo and Stroker, who worked with each other, and with the help from Michael Scofield, they ended up deadly, only Stroker on-screen and Theo died off-screen.