GREENWICH - 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 include saving a civilian's life with CPR, helping to rescue 150 people from a sinking ferry, and being part of a team that recovered $2 million worth of jewelry from a robbery.

Officers say Petrone was a policeman who inspired respect and affection from his colleagues. Police Chief James Heavey says Petrone always maintained a positive spirit, and that even when he lost the ability to speak, he would communicate with friends and colleagues via email.

Petrone leaves behind a daughter, who is in sixth grade.

A funeral will be held for Petrone at St. Mary's Church on Wednesday.