AUSTIN, Minn.  — A man believed to be a relief driver on an 18-wheeler was killed when the rig left the Interstate 90 pavement and rolled on its side into the median ditch. Killed was Ajish Thomas, age 45, of London, Ontario. The driver, Gemeesh Joseph, 41, of Kitchener, Ontario, was taken six miles to. the Austin hospital with lesser injuries. The accident was about 1:30 a.m. near the Browndale and Rose Creek exit. The men were westbound toward Autinn. The pavement was wet. Mower Conty deputies said Joseph was belted, Thomas not.