Marquise Jackson (dob 2/21/90) of Lancaster was found guilty of one count each of first-degree murder and child abuse resulting in death.
Sentencing is scheduled for Aug. 12 in Department B of the Los Angeles County Superior Court, Pasadena Branch. Jackson faces 25 years to life in state prison.
Deputy District Attorney Tamu Usher prosecuted the case.
According to the evidence presented at trial, Jackson drowned baby Mo’Nayjah Jackson at the apartment of the child’s mother, in the 100 block of West Del Mar Boulevard in Pasadena, while the mother was at work on May 20, 2011.
The case was investigated by the Pasadena Police Department.