BOSTON — The second and final suspect in the June armed robbery of a South Boston kids' lemonade stand walked into a Boston police district with his mother Thursday morning and turned himself in.

A 14-year-old male voluntarily surrendered at District C-6 in South Boston at 9:36 a.m., accompanied by his mother, according to a press release from the Boston Police Department. Detectives placed him under arrest on outstanding warrants for the June 10 armed robbery.

Before the kids could answer, one of the suspects reached into their setup and grabbed the cash box. The other then "intentionally displayed a black firearm in his waistband." Both fled the block on foot.

Boston Police District C-6 detectives worked the case for weeks, releasing surveillance stills of the two masked suspects and asking for public help identifying them.

The 14-year-old who turned himself in Thursday will be arraigned in Boston Juvenile Court on three charges: Delinquent to wit; Armed Robbery (two counts) and Delinquent to wit; Carrying a Firearm Without a License. BPD did not release the juvenile's name, mugshot or specific description, citing juvenile-justice protections.

Anyone with additional information about the incident can contact Boston Police District C-6 detectives at (617) 343-4571.