Police took Robert Somerville, 67, into custody at the scene and later charged him with murder, according to CBS Sacramento. Police recovered a .38 caliber pistol at the scene.
“My dad does not have any prior violent history or anything like that,” his son, Tre Somerville told the television station. “He’s really a community man, as well.
“I would like to say that you know my family would like to send our condolences to the Fortuna family,” Tre said “It’s very unfortunate what happened today, and it’s just a freak circumstance.”
At a press conference and surrounded by firefighters, Gardea called Fortuna, a 21-year member of the department, a "legacy firefighter."
"Today was a good representation of the type of person Max was. Max was a firefighter who showed up every day and never complained about being on the job," said Gardea. "I don't know too many other firefighter who enjoyed the job as much as him."
"This is my worst nightmare as a fire chief," Stockton Fire Chief Rick Edwards said. "My message to my firefighters is to be strong, my heart breaks with you but we will get through this."
Fortuna leaves behind a wife and two children.