Police say Jason Carroll Moss has been charged with misdemeanor harassment. Moss was arrested Friday night and freed early Saturday, hours before the reunion, on a personal recognizance bond.
Moss never showed up at the John Marshall High School class of 1992 reunion. About 150 people attended Saturday night's event in the San Antonio area as police patrolled nearby.
An affidavit says Moss, in the posting on a site for reunion activities, said he was picked on by fellow students and still wanted revenge. He was arrested after some people who noticed the posting contacted police.
No published phone number could immediately be located Monday for Moss.