Michael Rosenfield April 12, 2018 11:26 pm Yarmouth Police Officer Mourned After Shooting Death Officer Sean Gannon of the Yarmouth Police Department was shot and killed in Barnstable while serving a warrant. US & World Videos 1:00 Three dead in apparent murder-suicide in Lowell 3:05 100 protesters detained at Northeastern University 2:39 Community mourns police sergeant killed on duty 2:50 Community mourns Billerica police sergeant killed on duty 4:32 Anti-war protester at Northeastern speaks amid arrests: ‘We are peaceful students'