Los Angeles County prosecutors say Mejia (Meh-HEE'-yuh) Monterroso pleaded no contest to grand theft Friday. He also will have to pay nearly $14,000 in restitution.
Monterroso was arrested in December.
Prosecutors say the 23-year-old was a guard at the Toyota Sports Center in El Segundo last year when he took three championship rings and hundreds of gift cards during a night shift.
Police say they found two of the rings at his Inglewood home.