BOSTON (WHDH) - A Yarmouth K-9 officer killed in the line of duty last month was honored as “Big of the Year” by Big Brothers Big Sisters of Massachusetts.

Sgt. Sean Gannon was killed while serving an arrest warrant at a house in Marstons Mills. He also volunteered with Big Brothers Big Sisters, mentoring 12-year-old Rylee for the past three years. The two of them took trips to the beach and arcade together. Rylee joined Gannon’s parents to accept the Big of the Year award in Boston on Thursday.

“I think inside of the adult Sean, the law officer, in his off-hours, was still Sean the little boy who really loved to have fun,” said Gannon’s mother, Denise Gannon.

Yarmouth Police Chief Frank Frederickson said the department never knew Gannon was a Big Brother, not even mentioning it at a promotion interview.

“He went through his round of questioning and not once, at a time when you should be selling yourself, did he mention anything about what he’s doing with Big Brothers. That’s how under the surface it was,” said Frederickson.

Gannon’s parents said they see their son’s goodness in Rylee, who said he would like to be a police officer as well.

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