Slain Yarmouth police Officer Sean Gannon promoted posthumously to sergeant
WEST YARMOUTH — Almost a week after his death, the Yarmouth Police Department posthumously promoted K-9 Officer Sean Gannon to the position of sergeant.Gannon, 32, was shot and killed while trying to serve a warrant in Marstons Mills on Thursday.A New Bedford native, Gannon earned a degree in criminal justice from Westfield State University in 2007 and later graduated from Massachusetts Maritime Academy with a masters in Emergency Management in 2011. [...]