Worker killed in Sterling rock wall collapse mourned by loved ones

Brian Curtis Derby, a 67-year-old Townsend resident, was killed when a rock ledge collapsed on his excavator as he was working at a quarry in Sterling, Massachusetts. Follow NBC10 Boston: https://instagram.com/nbc10boston https://tiktok.com/@nbc10boston https://facebook.com/NBC10Boston https://twitter.com/NBC10Boston