Updated Feb. 19: Revised to include Azanae Manning's booking photo.

A Balch Springs man who was arrested in connection with Boston-area crime spree killed a Dallas man in 2016 after the victim got into an argument with his girlfriend, police say.

Matthew Ly Gallagher (Dallas County Sheriff's Department)

Matthew Ly Gallagher, 32, has been held in Suffolk County, Mass., since early January on a slew of charges.

On Jan. 30, Dallas detectives obtained a murder warrant for Gallagher in connection with the slaying of 45-year-old Lewis Cannon on July 19, 2016. Cannon was found shot to death in an alley in the 2700 block of South Beckley Avenue.

Police were looking for this man in connection with the slaying. (Dallas Police Department)

A witness told police that Gallagher, who owned a tobacco store and barbershop in Far East Dallas, had been looking for Cannon that morning. Gallagher refused to talk to detectives at that time, according to an arrest-warrant affidavit.

Cellphone records placed him near the scene of the slaying, police said — and that morning was the only time his cellphone was in that area.

Detectives later learned that 24-year-old Azanae Manning, Gallagher's girlfriend at that time, owned a car similar to one seen in surveillance footage fleeing the scene of the shooting.

Azanae Manning (Dallas County Sheriff's Department)

Another witness told detectives that Manning had admitted driving Gallagher around that morning in search of Cannon, with whom police say she had been arguing.

According to the affidavit, Manning stopped at one end of the alley where they found Cannon and let out Gallagher, who shot the other man dead. She then picked up Gallagher at the other end of the alley and they drove off, police say.

Manning was booked into the Dallas County jail Friday on a murder charge and released after posting bond.

Gallagher and Fredrick Deshon Williams, 29, of Dallas were indicted in late December in connection with a two-day smash-and-grab crime spree that stretched 30 miles across the Boston area.

Fredrick Deshon Williams (Dallas County Sheriff's Department)

According to prosecutors, the pair were part of a group of friends who traveled to Boston to watch the Celtics play the Cleveland Cavaliers in the NBA playoffs in May, the Boston Globe reported.

Before the Cavaliers' Game 1 win on May 17, Williams — wearing a LeBron James jersey — was seen buying crowbars at a hardware store, Suffolk County assistant district attorney Andrew Doherty said at his arraignment.

Early the next morning, authorities say, Gallagher, Williams and three other men stole a van in the city of Woburn, north of Boston, and then stole a safe and damaged an ATM at a gas station in nearby Everett. A second burglary attempt at a gas station in Cambridge triggered an alarm, and the group fled.

They then stole a second van in Boston and broke into another gas station, authorities say, but again fled after an alarm went off.

On May 19, police say the crew stole a third van in Stoughton, south of Boston, and used crowbars and a sledgehammer to break into three convenience stores in Brockton. The thieves made off with two safes and two ATMs.

In all, authorities say the burglars stole about $60,000. Doherty, the assistant district attorney, said during an arraignment that detectives were stunned by how the masked burglars "expertly … were able to break into the stores and get in and out" quickly.

Gallagher and Williams were then among several men questioned at Boston Logan International Airport later May 19 when security screeners found more than $50,000 in cash in their luggage. The men were allowed to continue with their travel, but authorities seized the money.

Gallagher and Williams each were charged with six counts of breaking and entering at night with intent to commit a felony, six counts of breaking into a depository, six counts of malicious destruction of property, four counts of larceny over $250, three counts of larceny of a motor vehicle, two counts of attempted larceny over $250 and one count of possession of burglarious instruments.

They both were arrested in Texas and extradited to Massachusetts, where they remain in custody. A third suspect was arrested in Florida, according to the Globe, and two others are at large.

Dallas detectives traveled to Massachusetts to interview Gallagher about the east Oak Cliff slaying, but he invoked his right to remain silent, police said.

Gallagher has a long criminal record in Texas, including convictions for theft, trespassing, unlawful possession of a firearm by a felon and drug possession in Dallas County, as well as assault-family violence in Denton County.