Police in West Windsor charged Mr. Brandon A. Butler, 31; Ms. Diamond M. Williams, 26, and Quan'Daesia "Daisy" T. Williams, 21, with committing the hold-up of a Sally Beauty store on Aug. 13.
Police say the trio are all from Trenton and charged with armed robbery and related crimes.
Quan'Daesia Williams remained at large Wednesday Butler, and Diamond Williams has since been arrested.
Police say Jones said Quan'Daesia Williams has family in the southern U.S. and investigators suspect she's fled in that direction.
According to authorities, Butler and Diamond Williams entered the store in the Nassau Park Pavilion off Route 1 at 6:20 p.m. while employees on duty were in the back of the store.
Police say Butler requested assistance, and one of the employees walked out front and was met by Butler, holding a handgun and wearing a mask. Butler allegedly pushed the gun in the female employee's stomach and demanded cash from the register.
Police say During this confrontation, he pulled back the gun's slide, cocking it - police suspect it was a semi-automatic weapon.
Police say Butler and Diamond Williams wore bandanas when they filled a plastic bag with cash.
Butler ordered one of the employees to open the nearby safe, but she did not have the key according to police.
Police say Butler went to the back and got the other employee and pointed his handgun at her face and demanded she open the safe. She did, and the robbers swiped more cash.
The suspects ran from the store and entered a red sedan, police said.
Police suspect Quan'Daesia Williams scoped out the business, and the one next door, and was aware of the plot to rob the store.
Anyone with information on Quan'Daesia Williams' whereabouts can contact Jones at 609-799-1222, jjones@westwindsorpolice.com or through West Windsor's anonymous tip line at 609-799-0452