WESTBROOK – A Westbrook High School teacher spent five days in jail this week after pleading guilty in Cumberland County Superior Court to a charge of furnishing a place for minors to consume liquor.

A second charge against Timothy Gillis, 43, of Portland, furnishing liquor to a minor, was dismissed, according to court documents.

In addition to spending five days in Cumberland County Jail, Gillis has surrendered his teaching license as part of a plea bargain with prosecutors, according to the documents.

Gillis taught English at the school for 18 years before resigning his position in September 2011. He also served as class adviser, coached soccer and tennis, and helped start programs such as the chess club and school newspaper.

Police said the charges came from an incident at Gillis’ Whitney Avenue apartment in August 2011, and followed an investigation by a Westbrook school resource officer. The court summons lists Officer Ryan Close as the investigating officer.

According to the court records, Gillis provided alcohol to a minor whose age would have been 16 in August. Police said last week that the investigation began after they received a complaint in September about the incident. Police issued a summons to Gillis on the charges on Dec. 30, 2011, according to the court papers.

Initially, Gillis simply disappeared from his position as soccer coach in September, with no explanation as to why. Within weeks, Gillis signed an agreement with the district to resign.

Gillis grew up in Westbrook and graduated from the high school in 1986. He received his bachelor’s degree at Stonehill College in North Easton, Mass., in 1990. He was first hired in March 1993 as a behavioral assistant at Prides Corner Primary School. Gillis has served as adviser to grades 9, 10, 11 and 12. He taught summer school and coached varsity soccer, junior varsity soccer, varsity tennis and supervised the weight room.