25 Investigates: Former Braintree officer accused of using police technology to track ex-girlfriend

BRAINTREE, Mass. — A now-former Braintree police officer is accused of using department technology to harass his ex-girlfriend.

25 Investigates obtained court records and police internal audits that show Mark Sherrick used the department’s Flock camera system to track her license plate more than 1,000 times.

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Sherrick is now facing a criminal harassment charge for harassing his ex-girlfriend.

According to court records, he placed a GPS device on her car and tracked it using a Braintree Police Department-issued cell phone.

25 Investigates also obtained an audit of how Braintree police were using their Flock cameras.

Records showed Sherrick searched for one license plate tied to his ex more than 1,049 times.

Court records say the harassment happened from January to February 2025.

However, the department’s Flock audit showed he started tracking her license plate on Aug. 20, 2024, around the same time the couple broke up, according to the criminal complaint.

POST Commission records indicate the former officer has been disciplined for several violations, including harassment.

The Braintree Police Department sent Boston 25 the following statement:

“The Town of Braintree can confirm that the queries in question are linked to former Braintree Police Detective Mark Sherrick, who retired from the Town on April 2, 2025, during an investigation by the Town into his conduct.

The Town’s investigation, conducted by a third party, revealed that the former Detective misused police resources, including license plate queries, for a personal matter unrelated to a legitimate operational or investigative reason. Given that this remains an active criminal investigation, the Town will not comment further on the details of the case at this time.

Under the leadership of Mayor Erin Joyce and newly appointed Police Chief Robert Kilroy, the Town is committed to upholding the highest standards of conduct for our police officers and ensuring the proper, responsible use of all law enforcement tools to maintain the public’s trust."

Boston 25 has reached out to the former officer for comment.

This is a developing story. Check back for updates as more information becomes available.

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