NBC May 10, 2018 7:37 pm New Details Released in Death of Sean Gannon A timeline of the moments leading up to the murder of Yarmouth Police Sgt. Sean Gannon was released Thursday. US & World Videos 2:39 MIT president calls for shutdown of student encampments 0:16 4 people seriously hurt after boat sinks off Cape Cod 2:35 Fallen Billerica police sergeant honored during vigil 2:09 President of MIT calls for shutting down pro-Palestinian encampments 1:00 Three dead in apparent murder-suicide in Lowell