On the morning of September 5, 2017, 21-year-old Alberto AJ Monteiro was fatally shot inside a barbershop on Stoughton Street in Dorchester, just about a mile from his home. He had been getting a haircut when a gunman entered and killed him in what investigators described as a brazen, targeted attack that shocked the neighborhood.

Monteiro was a graduate of Catholic Memorial High School and a Regis College student studying Business Management. Family remembered him as quiet, humble, and caring; they later established the AJ Monteiro Memorial Scholarship Fund to help low-income students in Dorchester.

Federal court filings in June 2020, produced during a large investigation into the NOB street gang, named a gang member, Ricky Pina, as a suspect and described GPS data from a court-ordered monitoring device that allegedly showed him driving past the barbershop multiple times before the shooting. Despite those leads, no one has been formally charged in Monteiro’s murder and the case remains an unsolved homicide.

Did anyone in Dorchester see unusual activity near the barbershop on September 5, 2017, or have information about the people involved that could help the investigation?