At the end of Season 3 of NBC’s Chicago Fire, firefighter Peter Mills, played by Charlie Barnett, left the show, leaving many fans feeling sad and confused. Mills left Firehouse 51 for North ...

NBC's Chicago Fire has seen its fair share of emotional exits, but few left fans as heartbroken as the departure of firefighter and paramedic Peter Mills, played by Charlie Barnett. Introduced in ...

Read more, below. Peter Mills (Charlie Barnett) and Christopher Herrmann (David Eigenberg) on Chicago Fire Season 2 Episode 12. Photo: Elizabeth Morris/NBC "We were super, super tight back then ...