Jonathan Patrick Tatone, 45, of Acton is the suspect in Tuesday's shooting.
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Officials believe Tatone was involved in an ongoing dispute with a fellow firefighter that resulted in the deadly shooting.
RELATED: 1 firefighter killed, 1 hurt in shooting at Calif. fire station
They say off-duty Tatone showed up at the Agua Dulce station Tuesday morning and opened fire, killing firefighter Tory Carlon. The 44-year-old victim had worked for the Los Angeles County department for more than 20 years. He was married with three daughters.
A GoFundMe page has been created to help Carlon's family.
The shooting also wounded a fire captain who was not believed to have been intentionally targeted. The 54-year-old captain underwent surgery and was recovering in critical but stable condition.
Fire captain stabilized after shooting at Agua Dulce station
Agua Dulce shooting: Fire captain stabilized at hospital after surgery for gunshot wounds
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After the shooting, Tatone drove to his home in Acton, set it on fire and killed himself, sources say. His body was found in a pool outside the home by responding sheriff's deputies.
His official cause of death has not been released.