Thomas Welch, 19, was arrested on Dec. 21 for violating his probation after police received a call that he was in the Town Hall parking lot at approximately 1:25 p.m.

As it turns out, Welch was identified by police as the "unwanted person" trespassing on the grounds of New Canaan High School at 11:25 a.m. on Dec. 20.

At the time of the trespassing, police and New Canaan High School Principal Tony Pavia made it clear there are no safety concerns for the students and that the administration is familiar with Welch.

"He's done this before," Pavia said. "He is a former student, not a graduate, and we have made it clear that he is not allowed on school property." Pavia also indicated that Welch has done this before for reasons generally unknown.

"We haven't seen him in over a year," Pavia added. "I think today [Dec. 20] he may have been looking for a friend of his but otherwise I haven't a clue as to why he keeps coming when he knows he is trespassing." Pavia said that the police are handling the situation now, but the school will attempt to contact the individual's family and make it clear, once again, that he should not trespass on school property.

The original charge on Welch was from a Norwalk case. According to police, he was charged with second degree Assault with a Motor Vehicle on Nov. 29, 2008. New Canaan Police were able to apprehend and arrest Welch due to an active warrant out for the violation of his probation.

Welch was held at the New Canaan Police Department on a $30,000 bond and is due in court on the morning of Dec. 22 in Norwalk. Charges related to trespassing in New Canaan High School are still pending, police said.