| John Gruner | |
| Name | John Gruner |
| Pathology | Arsonist Murderer |
| Family | Emily Wilder (ex-wife) Hannah Wilder (daughter) |
| Status | Imprisoned |
| Actor | Robert Spillane |
| First Appearance | "In God We Trust" |
John Gruner was an arsonist and murderer. He set his ex-wife's apartment on fire in an attempt to kill her, but instead, a firefighter was killed. It was later revealed that he was shot by an abandoned gun that discharged due to the heat of the fire.
Gruner was charged with arson and felony murder, receiving a 25-to-life sentence. (L&O: "In God We Trust")
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