The driver of a van that crashed into a semi truck on snow-covered Highway 58 in March was sentenced to prison yesterday. 27-year old Sean O'Kelly will serve just under three years in prison. The crash happend March 16, about two miles west of the Lane / Klamath County line. The accident killed 34-year old Leah Kentta of Klamath Falls. She was a passenger in a van driven by another Klamath Falls resident who received non-life threatening injuries.