A St. Mary’s judge sentenced a Waldorf man on Monday to 15 years in prison from his guilty plea to conspiracy to commit armed robbery following a holdup last year at a Radio Shack store in Charlotte Hall.

Demond James Gleaton, now 39, was arrested about three weeks after the May 27, 2011, heist at the store, where court papers state a man carrying a handgun and duffel bag confronted a store employee, and tied him up in a back room before stealing cell phones, video game systems and a computer from sales racks and display cases.

St. Mary’s Circuit Judge Michael J. Stamm ordered Gleaton to pay $9,220 in restitution. The judge gave Gleaton credit for 410 days served in pretrial custody, but did not suspend any of the 15-year prison sentence.

“He had four prior violations of probation,” St. Mary’s Assistant State’s Attorney Joseph Stanalonis said Tuesday at his office across a hallway from the courtroom. A sentencing guidelines worksheet recommended that Gleaton be sentenced to between 12 and 20 years in prison, and the prosecutor said that Gleaton’s past offenses included two burglaries and nine thefts, mostly in Prince George’s County.

In the Radio Shack robbery, Stanalonis said, “He indicated through his attorney that a second person was the actual robber, and that he was the co-conspirator but did not actually go into the store.”

Gleaton originally was charged with additional theft offenses by St. Mary’s detectives investigating earlier incidents at the Radio Shack.

Cell phones and video game equipment valued at about $3,000 were reported missing from the business in September 2009, court papers state, and police recovered fingerprints at the business on May 4 of last year after a video game system valued at $249 was reported missing. Charges against Gleaton were requested after investigators matched his fingerprints to the ones found at the store three weeks before the robbery, according to a charges application filed by St. Mary’s detective Richard McCoy.

jwharton@somdnews.com