The Person Who Killed Hayes in Chicago Fire: Fact-Checking Character Deaths and Name Disambiguation

In Chicago Fire, there is no prominent character named "Hayes" who was killed. The question likely refers to Timothy Campbell, who murdered Matthew Casey’s fiancée, Hallie Thomas, in Season 1, or Trenton Lamont (alias Kevin Gish), the serial arsonist responsible for the death of Leslie Shay in Season 3.

While the name "Hayes" is associated with Grant Hayes, Stella Kidd’s troubled ex-husband who appeared in Season 5, that character was not killed; he was institutionalized following a violent confrontation with Kelly Severide and Kidd. Given the high stakes and frequent tragedies within the One Chicago universe, it is common for viewers to conflate names or recall specific villains while misremembering the identity of their victims.

Disambiguating the Name "Hayes" in the Chicago Fire Universe

As we look back from the perspective of 2026, the history of Chicago Fire is marked by several harrowing character exits. When searching for "the person who killed Hayes," viewers are typically navigating a few different narrative threads. To provide a comprehensive answer, we must examine the characters whose names are phonetically similar or whose stories involve a character named Hayes.

Grant Hayes: The Only "Hayes" of Note

The most recognizable character with the surname Hayes is Grant Hayes (played by Guy Burnet). Introduced as the drug-addicted and unstable ex-husband of Stella Kidd, Grant was a recurring antagonist in the early seasons of Kidd’s tenure at Firehouse 51.

Grant did not die in the series. Instead, his arc reached a climax when he attempted to attack Kelly Severide and Stella Kidd. After a violent altercation, he was hospitalized and subsequently moved to a psychiatric facility and rehab. If your search led you to believe he was killed, it may be due to the intensity of the scene where Severide was forced to defend Kidd, which left Grant in critical condition.

The Confusion with Hallie Thomas

Many fans who ask about a character named "Hayes" being killed are actually recalling the tragic murder of Hallie Thomas (played by Teri Reeves). Hallie was a doctor and the long-time love interest of Matthew Casey. Her death remains one of the most shocking "murders" in the show's history because it involved a criminal conspiracy rather than a standard firefighting accident.

The Confusion with Detective Holloway

Another possibility is Detective Bianca Holloway, a character whose death occurs under the protection of Firehouse 51. Because her name is phonetically distinct but her story is a classic "murder" mystery within the show, she is often the subject of inquiries regarding intentional killings versus accidental line-of-duty deaths.

Who Killed Hallie Thomas? (The Season 1 Mystery)

The murder of Hallie Thomas is the most significant intentional killing of a character close to the main cast in the early years of the show. Understanding who killed her requires looking into the "Coronado Clinic" plotline.

The Culprit: Timothy Campbell

The person who physically killed Hallie Thomas was Timothy Campbell. Campbell was a thug and "fixer" who worked for a group of corrupt individuals running a clinic that served as a front for illegal activities, including the distribution of prescription drugs.

The Circumstances of the Murder

In the penultimate episode of Season 1, Hallie discovered that the clinic where she worked was involved in a massive racketeering scheme. Before she could report her findings to the authorities or to Casey, the clinic was set on fire. While it initially appeared that Hallie died due to the fire (smoke inhalation and thermal injuries), it was later revealed during the autopsy and subsequent investigation by the Intelligence Unit (led by Hank Voight) that she had been struck in the back of the head.

Timothy Campbell had murdered her to keep her quiet and then set the fire to destroy the evidence of the crime. This discovery shifted the narrative from a tragic accident to a homicide investigation, marking one of the first major crossovers between Chicago Fire and Chicago P.D.

The Aftermath

Casey’s grief over Hallie’s death defined his character for several seasons. The eventual capture of Timothy Campbell and the exposure of the clinic’s owners provided some closure, but the event permanently hardened Casey’s resolve as a leader.

Who Killed Leslie Shay? (The Season 3 Arson Case)

If the name "Hayes" has been confused with the most famous death in the show's history, the answer involves the arsonist who took the life of Leslie Shay.

The Culprit: Trenton Lamont (Kevin Gish)

Leslie Shay was killed in the Season 3 premiere, "Always," following a cliffhanger explosion at a warehouse fire. For months, the death was treated as a tragic accident of the job. However, as the season progressed, evidence surfaced that the fire had been deliberately set.

The killer was eventually identified as Trenton Lamont, a serial arsonist who used various aliases, most notably Kevin Gish.

The Motive and Execution

Lamont was an obsessed arsonist who targeted Firehouse 51 specifically. He didn't just want to see buildings burn; he wanted to destroy the people who put the fires out. He meticulously planned the warehouse fire, knowing exactly how the structural elements would react to the heat. Shay was struck by a falling pipe during the collapse, leading to a fatal head injury.

Justice for Shay

The hunt for Shay’s killer spanned multiple episodes and involved a deep collaboration between Severide, Dawson, and the Chicago P.D. team. Lamont was eventually cornered by Severide and Voight. In a tense confrontation, Lamont was killed, bringing a violent end to the man who had haunted the firehouse.

The Murder of Detective Bianca Holloway

For those remembering a character being "killed" rather than dying in a fire, Detective Holloway’s arc in Season 4 is a prime candidate for the "Hayes" confusion.

The Culprit: The Cartel Hitmen

Detective Bianca Holloway was a narcotics officer who had been using Firehouse 51 as a safe house for her young son, JJ, while she testified in a high-stakes undercover case against a powerful cartel.

The Event

Holloway was murdered in a drive-by shooting outside the courthouse where she was set to testify. While the specific triggerman was a faceless mercenary for the cartel, her death was a calculated "hit" intended to silence her. The impact on the firehouse was profound, particularly for Kelly Severide, who had bonded with JJ and had to break the news to the boy that his mother would not be coming back.

Comparing Key "Murder" Plotlines in Chicago Fire

The following table summarizes the most notable intentional deaths (murders/homicides) in Chicago Fire history to help identify the character you may be looking for.

Why Do Names Like "Hayes" Get Confused?

In a long-running procedural like Chicago Fire, which has surpassed 13 seasons as of 2026, viewers often deal with "name fatigue." There are several reasons why you might be searching for "Hayes" when looking for a killer:

1. Phonetic Similarity: The names Hadley (the villainous arsonist Kevin Hadley), Hallie, and Hawkins (Chief Evan Hawkins) all share similar vowel sounds or starting consonants with "Hayes."
2. The "Grant Hayes" Factor: Because a character named Grant Hayes was a prominent villain who tried to kill a main character, the brain often associates that name with death or murder, even though Grant himself survived the series.
3. Crossover Confusion: The One Chicago universe (Fire, P.D., and Med) shares dozens of guest stars. A character named Hayes may have been killed on Chicago P.D. or Chicago Med, leading viewers to search for the death under the Chicago Fire banner.
4. Misremembered Guest Stars: In early seasons, many minor victims of the week were killed by arsonists or criminals. A guest character named Hayes in a "victim of the week" role might have stayed in a viewer's memory without being a series regular.

Frequently Asked Questions

Did Grant Hayes die in Chicago Fire?

No. Grant Hayes appeared in Season 5 and was a recurring antagonist for Stella Kidd and Kelly Severide. While he was severely injured in a fight with Severide after he tried to attack the couple with a knife, he survived the encounter. He was eventually sent to a psychiatric facility and has not returned to the show as of the 2026 season.

Who is the most famous killer in Chicago Fire?

The most "famous" or notorious killer is Trenton Lamont (Kevin Gish). He is widely hated by the fanbase for killing Leslie Shay, one of the original and most beloved members of Firehouse 51. His plotline was one of the first to truly integrate the serialized mystery elements into the firefighting procedural format.

Was Matthew Casey ever accused of killing someone?

Matthew Casey was never a murderer, but he was frequently at odds with Hank Voight in Season 1. Voight attempted to intimidate Casey into dropping charges against Voight’s son, Justin, who had caused a drunk driving accident. This rivalry is often remembered as a "life or death" struggle, though Casey remained on the side of the law.

Who killed Chief Hawkins?

Chief Evan Hawkins was not killed by a person; he died a hero’s death in Season 11. During a massive cinema fire, a part of the building collapsed while he was helping victims. Unlike Hallie Thomas or Leslie Shay, there was no criminal intent behind his death—it was a tragic consequence of the dangers of firefighting.

Is there a character named Hayes in the 2024-2026 seasons?

As of 2026, there has not been a major character named Hayes introduced as a member of Firehouse 51. The show has introduced several new characters like Chief Dom Pascal and Lyla Novak, but none share the surname Hayes.

Practical Recommendation for Fans

If you are trying to track down a specific episode involving a "Hayes" or a murder mystery you remember, the best course of action is to revisit the Season 1 finale ("A Hell of a Ride") and the Season 3 premiere ("Always"). These two episodes contain the most significant "killer" reveals in the series.

If you are specifically interested in the character Grant Hayes, his most pivotal episodes are in the early half of Season 5, specifically the episodes "The Hose or the Animal" and "A Real Shot in the Arm."

For those following the One Chicago chronological order, remember that many murder investigations that begin in Chicago Fire are actually resolved in Chicago P.D. If the "Hayes" you are looking for was a victim of a crime, the resolution is likely found in an episode featuring the Intelligence Unit.