CHICAGO — A former Chicago high school teacher received a probation sentence after pleading guilty to sexually abusing a 15-year-old boy.

Benjamin Zollo pleaded guilty to aggravated criminal sexual abuse charges. Cook County Circuit Judge Thomas Gainer sentenced him Thursday to two years of probation.

Prosecutors say the 34-year-old Zollo, who taught at Lincoln Park High School, contacted the boy online. After exchanging messages for a month, the boy went to Zollo’s home, where they had sex. They eventually met every two weeks, before the teen spent the night with the Zollo on New Year’s Eve 2015.

Prosecutors said the boy’s parents were upset he was gone all night and called police. When by his father, the boy admitted where he had been.

Zollo was arrested last year at the high school.