The bloodbath at a Brooklyn after-hours dice game was triggered by a man who claimed one of the players cheated, a victim’s relative told The Post on Sunday.

“The detective told us it was a case of someone thought they were cheated and wanted their money back, plus other people’s money,” Eddie Baldwin, the brother of Terence Bishop, told The Post.

Police sources confirmed that the gunplay appeared to have been kicked off by a gambler calling foul.

Bishop, 37 was killed along with three others, including his 32-year-old pal, John Thomas, in the early Saturday shoot-up at a catering hall, Triple A Aces, on Utica Avenue in Crown Heights.

The game of Cee-lo turned fatal just before 7 a.m., when another man, Chester Goode, pulled out a pistol after calling foul on a player, according to police sources and Bishop’s family.

A gun-toting security guard for the joint, Dominick Wimbush, 47, then stepped in after Goode fired shots into the ceiling and ordered everyone down on the floor — sparking the fatal shootout that also left three others injured, authorities have said. Goode and Wimbush also were among those killed.

“Terence was a good guy and innocent. This was over money? Money is always there. You only have one life,” said Baldwin, 35.

The cost of the violence was laid bare Sunday afternoon as a young woman — identified by locals as Wimbush’s daughter — ran up to the shuttered gambling joint wailing for her lost father.

“I want my dad!” the distraught woman screamed as she collapsed to the ground. “I want my dad!”

A group of onlookers helped her to her feet, and together began to pray.

Additional reporting by Tina Moore and Aaron Feis