A man the feds have dubbed “the Inconvenient Crook” is in custody after what officials suspect has been months of robbing and terrorizing shopkeepers in Boston, Milton and Quincy.

Tykei Hallman, 25, of Hyde Park, is charged with just one robbery stemming from an incident in which the feds say he knocked over a Quincy convenience store. He was arraigned on that charge — robbery involving the use of a firearm — Friday afternoon in federal court, where Judge Donald Cabell ordered him held pending a detention hearing next Friday. He was arrested earlier Friday in Fitchburg.

Authorities say they suspect him in 14 other similar robberies in which a masked, armed man robbed stores around the area. The FBI’s charging documents say the robbery spree of “the Inconvenient Crook” ran from May until November — including repeat robberies at some of the same stores.

The string of robberies in question began on May 24, when the masked armed man in gray made his first appearance, according to the FBI. The man entered the Fairmont Food Mart in Hyde Park around 10:20 p.m., whipped out a silver and black handgun and demanded money — making off with $300 to $400, the charging documents state.

The man next showed up at that same store on July 12, when he waved a handgun to the very same cashier, demanding more money, the FBI states. That time, he stole $1,000 — and the cashier told the cops it appeared to be the same thief.

Cops say Hallman appears to have had a very productive second half of August, starting Aug. 17, when they say hit Five Corners Market in Quincy and Milton Food Mart in Milton about an hour apart, making off with $5,126 from the registers, 22 packs of Newports and an additional six bucks from a clerk’s wallet.

The next day, Hallman is suspected of bouncing back to Quincy to knock over Mullaney’s Variety Package in Quincy, stealing $200 at gunpoint.

The day after that was an alleged two-fer, too, when cops say they suspect Hallman robbed MVP Liquors in Roslindale and Terri’s Market in Dedham within an hour, making off more than $1,000. He then allegedly took a couple of days off before getting back to business and robbing PIT Stop Store in Hyde Park of $400, and then heading back to his old robbin’ grounds of the Milton Food Mart, which he relieved of $1,500, according to the feds.

Throughout the fall, he’d hit Quincy establishments Everest Market in Quincy for $1,200 and Sam’s Variety Store for $2,000 before circling back to Five Corners Market, where he stole $2500 — though this time that money included a GPS tracker, according to the charging documents. He’d eventually try his luck north of Boston at Minit Mart in Woburn, stealing $200, before heading back to commit some more repeat robberies at Sam’s Variety Store for $2,000 and Mullaney’s Variety Package for $300, the feds say.