A Stamford police officer on administrative leave following his arrest on domestic violence charges resigned over the summer.

Police say Gregory Zach, 42, of Monroe, was a 20-year veteran of the force until his resignation on July 25.

Zach’s resignation was first reported by the Stamford Advocate. It was confirmed by the Stamford police department.

Police say he was on administrative leave on domestic violence charges that included assault, strangulation, threatening and disorderly conduct.

According to Zach's arrest warrant, the charges involve a woman he was dating and pertain to four separate incidents that took place from October 2024 through June.

He is also facing charges for violating a protection order. In August, police say he was arrested at Tweed Airport after a magazine with live ammunition was found in his bag. There was no firearm.

Officers say that Tweed elected not to pursue an arrest, however Zach was in violation of a protective order which prohibits him from possessing ammunition.

Zach has been investigated internally before. In 2009, a woman claimed he punched her in the face during an arrest downtown. Zach was suspended and put on probation after the department determined he used excessive force.