A firefighter from California is facing homicide charges in the deaths of his 29-year-old girlfriend and her son, according to authorities.

Darin McFarlin, 47, stands accused of killing his girlfriend Marissa N. Divodi-Lessa and her son, who was identified by family as Josiah Divodi-Lessa.

The El Dorado County Sheriff’s Office said its deputies responded to a shooting around 9 p.m. Thursday to a home in the 3000 block of Oakwood Road in Cameron Park, which is some 30 miles east on Sacramento. When they arrived, they found the two victims inside the home suffering from gunshot wounds. Divodi-Lessa was pronounced dead on scene while paramedics rushed her son to the hospital where he later died.

Investigators identified McFarlin as a person of interest and arrested him a couple hours later on homicide charges. McFarlin works for California Department of Forestry and Fire Protection, known as CalFire.

According to local NBC affiliate KCRA, McFarlin is a fire captain for the Amador El Dorado unit. The agency, which is tasked with fighting California’s wildfires, told KCRA that it is monitoring the situation. Meanwhile, more than 1,000 of his fellow firefighters are battling a nearby wildfire that was 37 percent contained as of Sunday morning.

Cops have not released a motive for the slaying. A criminal complaint that would further detail circumstances of the homicides was not immediately available.

Divodi-Lessa leaves behind a daughter. A GoFundMe page included a message from the girl about her mother and younger brother, who went by JoJo.

She always made me laugh. She would always tuck in at night and we would always tell each other, “I love you.” “I love you more.” “I love you most.” We loved playing card games, watching movies and hanging out. My brother, JoJo, would always play games with me, especially Hide-and-Seek. That day, we made a box with cute necklaces. The box had a lock on it. It was filled with toys in it (as rewards) for whenever he was good. He was such a sweet boy. JoJo had some health issues and Mommy was so good about being sure he had the right foods and proper care. She was the best Mommy everrrrr!

Josiah was a second-grader at Blue Oak Elementary School, KCRA reported.

McFarlin remains at the El Dorado County Jail without bond.