BOSTON (CBS) -It took investigators a few days to finally identify the suspect under arrest in the Woburn jewelry heist and shooting of officer Robert DiNapoli.

He’s 25-year-old Antonio Matos, and WBZ-TV has exclusive pictures of the suspect charged with armed robbery and assault with intent to murder.

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Matos remains hospitalized in serious condition and has yet to be arraigned. The pictures were found on a social networking site, and among them, photos of Matos at what appears to be a firing range.

WBZ-TV’s Beth Germano reports

Matos had been living in a Roxbury apartment with his mother, though the Boston Housing Authority says he is not listed as a tenant. Sources tell WBZ-TV it was his mother who identified Matos to police after seeing released photos of his distinctive tattoos that she recognized.

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Photo appears to show Matos firing a gun at a range.

In the meantime, officer DiNapoli is now home from the hospital after being shot as many as seven times when he responded to the call for an armed robbery at Musto Jewelers.

Investigators are still waiting for ballistics evidence to determine if Matos is the one who fired the shots. He was also injured in a gunfight with police.

With as many as three other suspects still on the run, another key piece of evidence has been located. The vehicle, a grey toyota camary, that may have been their getaway car was found on a street in Jamaica Plain.

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Because Matos remains hospitalized, he has not yet been arraigned on the charges.