The Boston Police Department reports that this time they're sure they have the man who murdered Jose Luis Phinn Williams as he worked at a Codman Square gas station on Oct. 5.

Working with the FBI and Canton Police, BPD officers today arrested Gregory Simmons, 26, of Dorchester for Williams' murder just a few days before he was to turn 68.

Police had initially arrested another Dorchester man for Williams' murder, but the DA's office dropped the charges against him in November.

Police say that in addition to murder, Simmons was charged with attempted armed robbery while masked and unlawful possession of a firearm. They say he is also facing armed-robbery charges in Stoughton District Court.