A California man was arrested after a toddler he lived with reportedly used his pistol to fatally shoot himself.

The Fresno Bee reports that Jace Alexander, 2, was found at his Fresno home with a gunshot wound to the head and was later pronounced dead at a nearby hospital. The child’s father, Jonathan Alexander, was working Saturday, but roommates Jena Moya and Oscar Ramos, 35, were responsible for watching him.

The couple was reportedly in another room when they heard a “pop” from a bedroom and discovered the toddler face down on the floor and the pistol on the bed. Police said Moya was unable to reach 911 and instructed Ramos to do so. Instead, Ramos allegedly hesitated, leading Moya to call 911 about some 5 to 10 minutes after the toddler was found shot.

Fresno police Chief Jerry Dyer said Ramos took “full responsibility” for Jace’s death, telling investigators that he last saw the gun the evening prior on an entertainment center. According to Dyer, Jace’s father had previously instructed Ramos to not leave the gun out. Ramos had a gun safe in his bedroom, according to The Fresno Bee.

Ramos was charged with criminal storage of a firearm and possession of high-capacity magazines capable of holding more than 10 cartridges.

“This was a death that was completely avoidable,” Dyer said during a Monday press conference, according to the Los Angeles Times. “We have a 2-year-old boy in our city today who is dead, a father who is grieving and will never be the same, as a result of the negligent act of one individual.”

[Featured image: Fresno Police Department]