Christopher Knight, a 25-year-old resident of Sanford, Maine, pleaded guilty on Thursday to conspiring to sell cocaine in the Portsmouth area. During a hearing in U.S. District Court, Knight acknowledged that on several occasions in 2005 he purchased cocaine from another person and, with the knowledge of that person, sold the cocaine to other people, according to a press release from the U.S. Department of Justice.

Knight is one of several people who were arrested and charged with drug-related offenses following an investigation of several months that was conducted by the Drug Enforcement Administration, the Portsmouth Police Department and other law enforcement agencies. The investigation focused on the distribution of Ecstacy, cocaine and marijuana in the Portsmouth area.

Knight will be sentenced by U.S. District Court Judge Joseph DiClerico next September. The maximum prison sentence for the offense to which Knight pleaded guilty is 20 years.