Elaine Halstead, Will and Jay Halstead's youngest sister, who was a firefighter at Station 19 in Seattle, Washington. After a fire killed her bestfriend and partner, Amalia, Elaine moves from Seattle back to Chicago and beings to work at Firehose 51, where she meets Lieutenant Severide and Captain Casey. During her first shift, her brother and his best friend come to interrogate her on the fire but the information they disclose changes Elaine's life with just a couple of words. matt casey x oc