Police have charged a 16-year-old with second-degree murder in the stabbing death of Gabriel Okeynan.

The boy, who cannot be named, is the second teenager charged with murder in the case. Earlier this month, police laid a charge of second-degree murder against a 13-year-old boy as well.

Okeynan, 45, was stabbed during a robbery attempt outside Marlborough Mall on June 20 and succumbed to his injuries several days later.

The 16-year-old was previously charged with robbery.