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ST. LOUIS COUNTY, Mo. – A Minnesota man and former St. Louis County teacher pleaded guilty Tuesday to sexual assault and other charges after admitting to having sexual relationships with juveniles.

According to court documents, 69-year-old Donald Ingerson contacted St. Louis County prosecutors in 2012 to he admit he violated two young girls, thinking the statute of limitations on his crime had run out. It had not.

Ingerson pleaded guilty to forcible rape of a 16-year-old in 1974, sexual assault for a 1982 incident, and statutory sodomy of a 15-year-old in 1995.

Ingerson was employed at University City High School from 1976 until 1981, teaching biology and coaching football and wrestling. A spokesperson for the district said at the time they did not receive any complaints about him while he was working for the district.

Ingerson also taught science and coached at McCluer High School in the Ferguson-Florissant School District from 1987-2010. A spokesperson for the school district said it received no complaints while Ingerson taught there.

A spokesperson for the Ritenour School District verified Ingerson was an assistant baseball coach at Ritenour High School from June 2001 to September 2005, and then he left voluntarily and returned in February 2011 to be the freshman baseball coach at the school until April 2012.

The Ritenour School District spokesperson said no complaints were filed with the district against Ingerson.

Ingerson may have taught at three or four other school districts in St. Louis County.