An investigation involving a confidential informant led to the arrest of a 35-year-old Oak Harbor man suspected of dealing heroin, court documents state.

Prosecutors charged Phillip H. Collier in Island County Superior Court March 9 with possession with intent to deliver heroin, possession of methadone and maintaining premises for use of a controlled substance.

Collier is also accused of possessing a firearm while dealing heroin, which increases his potential prison sentence.

If convicted of the charges, Collier could face more than four years in prison.

Oak Harbor police worked with a confidential informant who conducted two “controlled purchases” of heroin from Collier, according to a report by Detective Sgt. Mike Bailey.

In December 2014, officers executed a search warrant on Collier’s home on Heller Road. Collier and two other residents were arrested.

Collier admitted that he uses heroin; he said he usually doesn’t sell it, but he has sold some in the past to people who asked for it, Bailey wrote.

Officers seized suspected heroin, digital scales and plastic bags from his bedroom, according to the report.

Collier also had a handgun and an “assault rifle” next to his night stand, the report states.