The toddler, David Hernandez, was found with his throat cut in the 43400 block of 57th Street W when deputies arrived around 10:55 p.m., officials said. He was pronounced dead at a local hospital.

The Los Angeles County Medical Examiner reported his manner of death as homicide and cause as “an incised wound of the neck.”

The Sheriff’s Department said in a news release that Rena Naulls, 39, of Lancaster, was transported to the hospital after allegedly attempting to take his own life at the scene.

Investigators said Naulls is the live-in boyfriend of the victim’s mother and named him “a person of interest” in the case. Naulls was admitted to the hospital and listed in stable condition, police said.

The Times previously reported that a source with knowledge of the investigation who was not authorized to speak publicly said a family friend went to the house at the behest of one of the boy’s relatives, found the child with his throat slit in a bathtub and called 911.

Three of the child’s older siblings, ages 9, 11 and 14, were unharmed and taken into protective custody by the Department of Children and Family Services, according to the source and the Sheriff’s Department. The Times reported that the family had no prior contacts with the Department of Children and Family Services.

No arrests have been made.