The video taken inside Patriot Skateboard shows two men, each about 6 feet tall, wearing dark clothing with hoods pulled over their heads, one with a handgun.
The Middlesex District Attorney's office says shop owner Shawn Clark of Saugus was shot multiple times outside on Jan. 29 following a confrontation with the men inside. They then fled on foot.
Family members say the 39-year-old Clark served in Iraq and Afghanistan and it had been his dream to open a skateboard shop. His aunt said he was the father of two sons.
Authorities are asking anyone who recognized the men in the video to call police.
This program aired on February 15, 2013. The audio for this program is not available.