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Authorities added charges this week against the mother of a toddler who was killed over the summer.

The mother’s boyfriend was arrested immediately after the July death of 13-month-old Peter Blanco.

Christina A. Blanco, 22, was booked Wednesday into Pima County jail on suspicion of murder and child abuse for her role in the death of her son, said Sgt. Mark Robinson, a Tucson Police Department spokesman.

The tot had suffered multiple injuries consistent with child abuse before his death, Robinson told the Star in July.

On July 14 Peter’s mother left him and his 4-year-old sister in the care of Alvaro Andres Ramos-Cardenas, 24, for several hours in the morning. About 9:30 a.m., Ramos-Cardenas told Christina Blanco, 22, that Peter wasn’t breathing, police have said.

Blanco called 911 from a home in the 300 block of West Canada Street, near South 12th Avenue and West Drexel Road.

The child was put on a life-support at University Medical Center but died about two days later, Robinson said.

Investigators arrested Ramos-Cardenas on suspicion of child the day Peter was taken to the hospital, Robinson said. When the child died detectives added a charge of first-degree murder. He was released to pre-trial services last month, records show. The status of his charges was not immediately available Thursday afternoon.

Police could not say exactly what role Blanco played nor how long the abuse had taken place because the investigation is ongoing, Robinson said.

The whereabouts of Peter’s 4-year-old sister was not immediately available Thursday.