A motorcyclist was killed in a highway crash in Newtown this morning. State Police say 48-year old William Jasmin of Danbury struck a concrete bridge rail between exits 11 and 13, around 7am. State Police say the man was ejected from the bike and struck the guardrail on top of the concrete bridge rail. Jasmin was pronounced dead at the scene. He came to rest in the right lane while the motorcycle landed in the left lane. The highway was closed for a time while police responded. The bike was towed from the scene. State Police say the cause of the crash is unknown at this time. Anyone who witnessed the accident is asked to contact Trooper Matthew Bell at Troop A in Southbury at (203) 267-2200.