Gregory Yates was a serial killer, that mostly killed nurses. He murdered Nadia Decotis. He was killed by Erin Lindsay in self-defense.
After the infamous criminal of Gregory Yates escapes from a New York prison, Lindsay and the team learn that he is on the road towards Chicago. The SVU team tells them that Yates has gathered information on Lindsay and Platt writes to a triple murder of Yates, Benson and Fin sit on the next plane to Chicago. Erin Lindsay shot and killed Yates in an extended stand-off.