Here's a round-up of the week's top news stories. State Senate president Therese Murray won't seek a 12th term. A drug overdose spike across the Cape proves deadly. A familiar whale "Wart" shows up again in Cape Cod Bay. New rules for oysters are going in place, because of problems with bacteria. An artificial reef may incorporates some of the debris from the demolition of Harwich High School. We check in about the Pilgrim nuclear plant and questions about evacuation plans for those on the Cape. And discussions about another bridge across Cape Cod Canal, for about $320 million.