A Winthrop man was locked up yesterday after allegedly threatening to kill his ex-girlfriend and “stab the first cop I see,” Suffolk County District Attorney Daniel F. Conley said.

RONALD ZAMPANTI (D.O.B. 2/10/70) was arraigned in East Boston District Court yesterday on charges of armed assault with intent to murder, kidnapping, assault with a dangerous weapon, carrying a dangerous weapon, threats to commit a crime, disturbing the peace, refusing to identify himself, and resisting arrest.

District Court Judge Thomas C. Horgan set Zampanti’s bail at $50,000 and, at prosecutors’ request, revoked his bail on a pending charge of operating with a suspended driver’s license. Horgan also ordered Zampanti to abide by a restraining order that a Suffolk victim advocate helped her obtain.

Boston Police responded to a CVS store on Saratoga Street yesterday morning for a report of domestic violence. When they arrived, they found the Zampanti’s ex-girlfriend expressing fear for her safety and saying that he had demanded $150 from her as she gave him a ride. When she told him she didn’t have the money, Zampanti allegedly displayed a knife and threatened to kill her with it.

“If you call the police, I will stab the first cop I see,” Zampanti also allegedly told her.

The victim said she drove to the CVS because she wanted to get away with him in a public area.

The officers approached Zampanti in the parking lot, observing him to be nervous, sweaty, and shaking, with his left hand in his pocket. He allegedly refused the officers’ commands to show his hand, prompting the officers to physically remove it from the pocket.

The officers allegedly found a folding knife inside that pocket, a second knife in a sheath at his waistband, and a glass punch in his right pocket. When ordered from the car, Zampanti allegedly gave his name as “Ray Rossetti” and refused to sit on the curb. When he clenched his fists and continually turned away from the officers, they physically brought him to the ground for arrest.

“No one should have to live in fear of a partner or former partner,” Conley said. “I can’t stress enough that the victim here did exactly the right thing by calling police from a safe location, and I applaud Judge Horgan’s orders taking this defendant off the street.”

Conley urged anyone in a violent relationship to call 911 in an emergency. SafeLink, a statewide domestic violence hotline, can be reached at 877-785-2020.

“A violent relationship can feel inescapable,” he said, “but there are people who want to help. You don’t have to endure abuse, and you don’t have to go it alone.”

Cibel Barros is the DA’s assigned victim-witness advocate. Zampanti will be represented by attorney Kelli Lea Porges.