WEST YARMOUTH, Mass. (AP) — The Latest on a vigil held for a Massachusetts police officer who was killed while on duty (all times local):

11:10 p.m.

Hundreds of people are paying tribute to a Massachusetts police officer who was killed while on duty.

Crying and holding candles, the mourners joined Yarmouth police at a vigil Saturday night for Sean Gannon, The 32-year-old officer was fatally shot in the head while carrying out an arrest warrant Thursday. Gannon's police dog, Nero, also was shot and is recovering from surgery.

Yarmouth Chief Frank Frederickson says the eight-year veteran had a bright future and was a "wonderful young man" who was like a son to him.

Gannon was the department's first full-time drug detection K-9 patrol officer.

People placed flowers, balloons, flags and a box of dog biscuits next to a parked police cruiser.

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2:26 p.m.

A vigil will be held to honor a Massachusetts police officer killed while on duty.

Yarmouth Police planned the vigil for 7 p.m. Saturday at the 9/11 memorial near police headquarters.

Thirty-two-year-old Sean Gannon was fatally shot in the head while carrying out an arrest warrant Thursday.

Yarmouth Chief Frank Frederickson said the eight-year veteran was a "wonderful young man" with a promising career ahead of him.

Prosecutors say 29-year-old Thomas Latanowich was charged in Barnstable District Court for the officer's death. The Somerville man police describe as a career criminal is being held without bail after pleading not guilty.

It could not immediately be determined if he has an attorney.