Hallie Thomas was a physician and one of the characters of Chicago Fire.
Hallie was engaged to and had a relationship with Matthew Casey for eight years, during which they separated and later reconciled.
Hallie is working at the clinic around her resident position at Lakeshore where Casey comes to visit her to give her some lunch. She notices something odd in the files, but puts it to one side.
Later, Casey and the rest of Firehouse 51 are called to the clinic in order to put out a fire. Casey and Severide finds Hallie inside the locked security cage used for drug storage and rescues her, only for her to be pronounced dead at the hospital. (Leaders Lead)
When the Medical Examiner's report comes back, it reveals that Hallie was killed before the clinic was set on fire. She was struck in the back of the head by Timothy Campbell as a result of the clinic being a drug trafficking hub and Hallie, along with one of the nurses, accidentally finding out about this. (Let Her Go)
During the course of the subsequent investigation, Antonio Dawson tells Casey that Hallie was murdered when she was struck on the back of her head prior to the fire. It was later revealed that the person responsible was Timothy Campbell, who was later fatally shot by Voight
Hallie had an on-and-off relationship with Matthew Casey for 8 years. They were engaged, however she broke it off. They later reconciled when Casey asked if they could start fresh. Later, Hallie informs Casey that she doesn't want to have children. Because of this, they break up again and she moves to South America.
When Hallie comes back, she and Casey reconciling their relationship as the begin to realise how much they missed each other, just before Hallie is killed in
(To Casey about Mills and Dawson) "That sneaky little bastard" 1x21
|Season 1 Appearances|
|"Pilot"||"Mon Amour"||"Professional Courtesy"||"One Minute"||"Hanging On"|
|"Rear View Mirror"||"Two Families"||"Leaving the Station"||"It Ain't Easy"||"Merry Christmas, Etc."|
|"God Has Spoken"||"Under the Knife"||"Warm and Dead"||"A Little Taste"||"Nazdarovya!"|
|"Viral"||"Better to Lie"||"Fireworks"||"A Coffin That Small"||"Ambition"|
|"Retaliation Hit"||"Leaders Lead"||"Let Her Go"||"A Hell of a Ride"|