(KMOV.com) -- A St. Charles woman has received a four-year prison sentence after she set off a sprinkler system at a dentist's office.
The incident occurred almost a year ago at St. Charles Dental on south Fifth Street.
Police say Melissa Frederick was in the rest room when she caused 10,000 worth of damage.
Frederick claims she lit a napkin on fire while doing her make-up and dropped it in the sink. However, a contractor said that was a lie and she most likely climbed on the sink to set the sprinkler heads on fire.