The Kentucky State Police has released the identity of a man killed this week in a collision between a motorcycle and a tractor-trailer. Troopers say it happened Monday on I-75 southbound in Whitley County. Investigators now say 66 year old John Romine of Carmel, Indiana was riding a BMW motorcycle when he rear-ended a tractor-trailer driven by 56 year old Marty T. Byrnes of Elizabethtown. Whitley County Coroner Andy Croley says Romine died from injuries sustained during the crash. Romine was wearing a helmet at the time. Byrnes was not injured. The crash blocked traffic for several hours. Kentucky State Police are still investigating.