On April 12, 2018, 32-year-old K-9 officer Sean Gannon of the Yarmouth Police Department was killed while serving an arrest warrant at a home on Blueberry Lane in Marstons Mills, Massachusetts. During an initial attic search with his canine partner Nero, officers found drugs and clothing. On a second, more thorough sweep, Gannon moved insulation and was exposed to a concealed man, who fired one fatal shot to the head. Gannon was taken to Cape Cod Hospital and pronounced dead; Nero was also shot and seriously wounded but survived.

The suspect, identified as career criminal Thomas Latanowich, barricaded himself in the house before surrendering. Investigators recovered a handgun hidden in pieces around the residence. Latanowich was charged with Gannon’s murder and related counts. During trial he claimed self-defense; prosecutors introduced evidence including text messages Latanowich sent immediately after the shooting. A jury convicted him of second-degree murder and other charges. Nero recovered; the community mourned a widely regarded young officer.

If anyone knew Officer Gannon or has information about the scene that has not been shared, please come forward.