The suspect in a 2011 armed robbery was arrested Tuesday, tracked down by investigators using DNA detected on a shirt and mask used during the hold-up and later found discarded on the road, according to police.

Derek Forsythe, 26, whose last known address was 73 Georgetown Road, Weston, was charged with first-degree robbery and sixth-degree larceny.

Forsythe was arrested Tuesday after DNA obtained on the shirt and mask worn by the robber of the Merit Country Store, 337 Main St., at about 3:30 a.m. Sept. 29, 2011, was matched with his DNA, police said.

The state's forensic laboratory advised local police that DNA on the items matched a known offender in the Combined DNA Index System data base, the police report states.

A search warrant was obtained for samples of Forsythe's DNA and further testing confirmed the results of the initial test, police said.

Forsythe, held in lieu of $35,000 court-set bond, is currently incarcerated on several unrelated charges, according to police.

He was arraigned Tuesday after detectives served the arrest warrant in Norwalk Superior Court.