A pregnant Chinatown woman fatally stabbed her co-worker Tuesday in a midday attack in the kitchen of a quaint Hudson River town restaurant, police said.

Rosa Ramirez, 27, who has two open criminal cases against her in Brooklyn, grabbed a butcher knife in the River City Grille in Irvington, Westchester County just before noon and repeatedly plunged it into the chest of Bonifacio Rodriguez, 39, a married father of two from Yonkers, according to law enforcement sources.

She didnt say word, she just grabbed a knife and stabbed him in the chest, a witness told police sources.

Rodriguez was taken to Westchester Medical Center where he died at 12:19 p.m.

Detectives are still investigating a motive in the case.

Ramirez, who is four months pregnant, was arraigned on one count of murder and held without bail in the Westchester County jail, according to Irvington police.

Ramirez, who started working at the Broadway eatery two weeks ago, was arrested twice in 2017 on assault and weapons possession charges stemming from two different incidents, accord court records. Those cases are pending.