SOUTHBRIDGE, Mass. (AP) — A Southbridge teacher charged with sending nude photos of himself to a high school student remains free on bail after pleading not guilty.

Joseph Zuniga of Webster pleaded not guilty Thursday to a charge of dissemination of obscene matter to a minor.

Police say the 23-year-old Southbridge Middle/High School teacher sent nude photos to the 17-year-old boy through a Facebook message. A school resource officer overheard students talking about it and alerted police.

The school district says Zuniga is no longer an employee. He taught English to non-native speakers.

He is free on $500 bail with conditions, including no unsupervised contact with children under 16, except his siblings.

Zuniga and his lawyer did not respond to questions from the media.