California mom pleads guilty to drowning 4-year-old autistic son

Patricia Corby sometimes cried and kept her head down during a preliminary hearing in San Diego County Superior Court, Wednesday, Sept. 5, 2012.

(CBS/AP) SAN DIEGO - A San Diego-area mother pleaded guilty Thursday to drowning her 4-year-old autistic son in a bathtub, the  San Diego Union Tribune reports.

On March 31, 37-year-old Patricia Corby drove to a San Diego police station and told authorities she had killed her son, Daniel, by filling a bathtub and holding the boy under water until he died.

Police found the boy's lifeless body, still wet, wrapped in a blanket in her car's back seat. After her arrest, Corby told authorities that she had no life because her existence was dedicated to her son.

She also tried to drown herself but failed.

She faces 15 years to life in prison at a Jan. 28 sentencing hearing.