Lauren German’s Leslie Shay was killed off in Chicago Fire season 3, and, as a fan-favorite character, it surprised quite a few viewers at the time. Chicago Fire is one of the many long-running network procedurals and a pillar of the One Chicago shared universe, currently still going strong in its 13th season. Of course, as with any lengthy network show, characters are bound to be killed off, and Chicago Fire has seen its fair share of deaths.