The firefighter was apparently involved in an ongoing dispute with a coworker at Fire Station 81 in Agua Dulce, sources told our sister station KABC.
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The suspect, who was off-duty at the time, shot that fellow firefighter at the station just before 11 a.m., and wounded a fire captain who was not believed to be intentionally targeted in the shooting.
The suspect then apparently drove to his own 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.
Officials say they still need to confirm the suspect's cause of death, but no deputies opened fire on the suspect and it was believed no one else was home at the time.
Agua Dulce firefighter shooting: County Fire Chief Daryl Osby provides update
The first shooting victim was pronounced dead at the fire station. He was described as a 44-year-old firefighter who had worked for the county fire department for more than 20 years.
Acton resident reacts to fire at suspect's home after fatal shooting at Agua Dulce fire station
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Acton resident reacts to fire at suspect's home after fatal shooting at Agua Dulce fire station
"He was a brave, committed, loyal member of our department," county Fire Chief Daryl Osby said.
The wounded captain is 54 years old. The captain was airlifted by helicopter to Henry Mayo Newhall Hospital in Valencia, where he underwent surgery and was described as recovering in critical but stable condition.
"I stand here with a heavy heart," Osby said at an afternoon briefing. "Today is truly a sad day and a tragic day for the Los Angeles County Fire Department."
Neither of the two firefighters who were shot were immediately identified by name.
After the shooting, the suspect is believed to have fled in a white Toyota Tundra pickup truck to his home in Acton, where a barricade situation ensued. The structure, located in the 2600 block of Bent Spur Drive, later erupted in flames.
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Firefighters on the ground did not initially attack the fire, refraining from approaching the house due to the apparent threat posed by the suspect.
Los Angeles County sheriff's deputies were staging at the end of the driveway as massive flames and thick black smoke emanated from the single-story structure. No nearby homes were threatened in the isolated area, and the possibility of a wildfire seemed low due to the visible brush clearance surrounding the burning house. There were no strong winds in the area.
Fire helicopters were performing multiple water drops from above as the roof collapsed.
Shortly after 1 p.m., sheriff's deputies in an armored vehicle began making their way up the driveway toward the home.
By around 4 p.m., most of the flames were out and firefighters were continuing to spray water on the smoldering wreckage of the home.
In response to news of the shooting, L.A. County Supervisor Kathryn Barger said she was on her way to the Agua Dulce fire station. "My heart is with our @LACOFD firefighters and the families of those affected," she tweeted, using the Fire Department's Twitter handle.