On a spring afternoon in 2018, a white Caucasian male named Sean Gannon, a 32-year-old K-9 officer with the Yarmouth Police Department, was part of a team of officers serving an arrest warrant in Marstons Mills, Massachusetts. The date was April 12, and the subject of the warrant was a career criminal named Thomas Latanowich, who was wanted for a probation violation. The officers descended on the Blueberry Lane residence, unaware of the tragedy that would soon unfold.
Inside the house, Officer Gannon and his canine partner, Nero, began a search for Latanowich. The pursuit led them to an unfinished attic, accessible through a small opening in a closet ceiling. During an initial sweep of the attic, Gannon and another officer discovered bags containing drugs and clothing, but no sign of the suspect. Acting on further evidence that someone was indeed concealed in the attic, Gannon, along with his K-9 and two other officers, ascended into the cramped space a second time. As Gannon moved a piece of insulation, he unknowingly exposed himself to Latanowich, who was hiding in an adjacent section of the attic created by an addition to the house. A single gunshot rang out, striking Gannon in the head. His fellow officers pulled him from the attic and desperately tried to save him, but his injuries were fatal. He was rushed to Cape Cod Hospital, where he was pronounced dead. In the chaos, Nero, Gannon's loyal K-9 partner, was also shot and seriously wounded.
Following the shooting, a tense standoff ensued as Latanowich barricaded himself inside the home. After negotiations, he eventually surrendered and was taken into custody. Investigators later recovered a handgun, broken down into several pieces, hidden in different parts of the house. Latanowich was arrested and subsequently charged with the murder of Officer Sean Gannon.
During his trial, Thomas Latanowich claimed he had acted in self-defense, stating he was afraid for his life and did not know he was shooting at a police officer. However, the prosecution presented compelling evidence to the contrary, including text messages Latanowich sent just moments after the shooting. In one message, he wrote, "I'm taking as many as I can," and in another, "I already shot him, it's too late." After deliberating for three days, a Barnstable Superior Court jury found Latanowich guilty of second-degree murder. He was also convicted on several other charges, including aggravated assault and battery with a dangerous weapon and mistreating a police dog. The judge sentenced him to life in prison with the possibility of parole after a minimum of 35 years. While Gannon's K-9 partner, Nero, survived his injuries and eventually recovered, the community was left to mourn the loss of a dedicated officer described by his chief as a "remarkable young man."
