Frank Hernandez Jr., 35, worked as a substitute teacher's assistant.
Hernandez, a San Fernando Valley resident, was taken into custody Wednesday after a search of his house. He was booked at Van Nuys Jail and held in lieu of $20,000 bail.
He had worked for the LAUSD since 2008.
The district released the following statement on Wednesday:
"He was arrested by LAPD detectives on charges of possession of child pornography. He was terminated today for unsatisfactory service effective at the close of business today. He was hired by the district in January of 2008 as a substitute special education trainee and he was in that status when he was separated from the district."
If you have any information about this case, you're urged to contact Crime Stoppers at (800) 222-TIPS.