SAN FRANCISCO --
Friday marked the one year anniversary of a fire that nearly killed a San Francisco fire fighter.
Investigators have concluded that it was an arson.
41-year-old fire fighter Chris Mora-Posey returned to the abandoned building to talk to KTVU on Friday.
The damage from the fire has not been repaired at the house on Felton Street.
But there are virtually no signs of the trauma and serious injuries the veteran firefighter suffered a year ago battling the arson that nearly killed him.
"I ended up inhaling super heated gases and chemicals. Apparently the carbon monoxide level to my system were at lethal levels. I'm fortunate to still be alive."
Mora-Posey was in a coma for three weeks, fighting for his life.
He suffered severe burns to his head and body, two collapsed lungs, and a torn shoulder.
Despite the pain and trauma, the firefighter says he plans to return to work.
"It's always been my passion . The community and the department has been great to me . I grew up in San Francisco. It's something i love."
Arson investigators have determined that the fire was set inside the home on the ground level, at the bottom of a staircase, and it spread quickly.
The home belongs to real estate agent Nancy Jen.
She told KTVU she is negotiating with her insurance company and that she is waiting for permits so she can fix her home and live here.
Sources told us her former husband Jimmy Jen is suspected of being responsible for setting the home on fire.
KTVU reached him by phone and he declined to comment, but has previously told us he's not responsible.
Firefighters like Deputy Chief Patrick Gardner expressed frustration over the lack of a resolution in this case.
"If this person did it once, and the likelihood of this person doing it again, and putting our firefighters at risk again is the same."
Captain Jeanine Nicholson was among the seven firefighters injured in this incident.
"Arson is a frustrating crime . Because it's easy to prove that it's arson but it's hard to prove that someone did it even though. We think we know who did this."
Mora-Posey hopes to return to work in May.
There is a $75,000 reward for information leading to the arrest of the person responsible.
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