A former Prince George’s County police officer accused of participating in a scheme to distribute black-market alcohol and cigarettes has reached a plea agreement with prosecutors, according to a Tuesday court filing.

Richard J. Delabrer, 45, of Laurel, who retired in November after more than two decades on the force, is scheduled to appear in U.S. District Court in Greenbelt on May 25 for a plea agreement hearing, court records state. Details of the agreement are not yet public.

Federal authorities allege that Delabrer and others were paid by a prominent liquor store owner to guard the transportation of untaxed alcohol in Maryland and Virginia. He was arrested in November and charged with conspiracy to commit extortion.

In court papers filed in a co-defendants’s case, federal prosecutors said Delabrer also purchased untaxed cigarettes from an undercover agent and then resold them.

The allegations of liquor and cigarette trafficking are part of a far-reaching corruption investigation in Prince George’s that became public in November when federal agents arrested County Executive Jack B. Johnson (D) and his wife, Leslie, a member of the County Council, federal officials said.

Jack Johnson is awaiting trial on bribery charges. County Council member Leslie Johnson (D- Mitchellville) has been charged with evidence tampering.

Delabrer’s attorney, James N. Papirmeister, declined to comment on Tuesday.

A police spokesman has said Delabrer joined the department in 1988.