The woman accused of stabbing a postal worker to death over a spot in line at a Harlem deli has a history of knife violence — and once threatened “to cut” one of her previous victims.

Jaia Cruz was arrested at least five times before she allegedly carried out the ruthless killing Thursday, law enforcement sources told The Post.

In July 2020, Cruz was caught waving an open box cutter at another person in Midtown West and shouting, “I’m going to cut him,” sources said. Cruz was ordered to get on the ground but refused.

Cruz was ordered to get on the ground, but refused. She was then pulled away by officers and busted  for resisting arrest.