Authorities believe that the man shown here, holding up the Pick n Go store, is Michael Wallace, of Somerville.

A man suspected of robbing the Pick n Go convenience store on Highland Avenue on June 6 has been arrested.
Michael Wallace, age 44, of Somerville was taken into custody by Somerville detectives with the assistance of Massachusetts State Police and the FBI Violent Crimes Task Force.
Wallace was arrested without incident after Somerville detectives received several tips naming him following the release of surveillance video to the media.
A warrant was issued for his arrest on Monday. A subsequent search led to the discovery of evidence believed to be connected to the Somerville robbery and other crimes. Wallace is being held without bail as of Tuesday morning.

(from The Somerville Police Dept)