The alleged wheelman in a 2009 triple homicide, who had been free on bail, is now behind bars after Boston police found him armed with a powerful .45-caliber handgun in Mattapan Monday evening, police said.

Officers were patrolling on Osceola Street about 6:30 p.m. due to a recent spike in violence, when they noticed people sitting on a porch while drinking from red plastic cups. As the officers approached, several people on the porch started walking away—including one person who was being closely watched by his peers, police said.

The suspect, later identified as Nigel A. Nichols, 25, of Brockton allegedly took off and ran through several backyards before being stopped by police. Officers asked him where he had tossed the firearm they suspected he was carrying, and Nichols allegedly responded, “I ain’t telling you,” adding an expletive, according to a Boston police report.

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Police recovered a Taurus PT 1911 handgun loaded with eight bullets, five of which were particularly deadly hollow-point bullets.

Nichols, according to Suffolk District Attorney Daniel F. Conley’s office, is currently under indictment on charges of being an accessory after the fact of murder for allegedly driving Keron Pierre from the scene of a triple shooting that left two women and one man dead on Mt. Ida Road during a party on March 29, 2009.

Nichols was originally held on $150,000 cash bail, but that amount was later lowered to $10,000 cash, an amount Nichols apparently was able to post. Pierre is still at large and believed to be out of the country, authorities said.

According to Suffolk prosecutors, Pierre shot the three victims, then jumped into the car driven by Nichols.

Nichols was arraigned Tuesday in West Roxbury Municipal Court on illegal gun possession and other charges and was ordered held on $100,000 cash bail. His bail on the accessory charge was also revoked, meaning that even if he posts bail in the new case, he will not be immediately released.