Homicide detectives are investigating the death of a baby boy who died Saturday from injuries he suffered in a suspected assault at a home in Lancaster earlier this week, authorities said.
The infant is believed to have been assaulted Tuesday evening at the home in the 43400 block of Gadsden Avenue, according to a statement from the Los Angeles County Sheriff's Department. Authorities responded to a "baby not breathing" call at the house about 5:20 p.m.
They were met at the house by the child's mother.
The baby was admitted to a nearby hospital, where he was treated for serious head trauma and bruising of the upper torso, authorities said. Authorities had initially identified the infant as female.
Later on Tuesday, authorities arrested Brittany Ingrassi, 30, of Lancaster. Authorities say she was a longtime friend of the baby's father and was babysitting at the time of the incident.
She was booked last week on a charge of cruelty to a child likely to produce great bodily injury or death.
At 12:50 a.m. Saturday, the baby died from his injuries, authorities said. Additional charges are expected to be filed against Ingrassi, sheriff's officials said.
The investigation is ongoing.