Greenwich police are mourning the loss of a longtime colleague.

Retired Sgt. Roger Petrone died this week at 44 years old, after a seven-year battle with ALS, also known as Lou Gehrig's Disease.

The flag in front of Greenwich police headquarters flew at half-staff today in honor of Petrone, a 20-year veteran of the department.

The department says some of Petrone's career highlights...

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