Police say Keith Chadwick, 32, was killed about 9:30 a.m. today when he was pinned against a fence at 33 Robinwood Drive by a falling tree. Joseph Fore of Fore’s Tree Service told police a tree he was cutting fell, then snapped off backwards, pinning Chadwick at the waist against a fence. He said Chadwick called for help, but died as he cut the tree away.