(Worthington, MN)  --  Icy roads were a factor in a weekend crash on Interstate 90 that killed a boy and left three others in criticial condition.  Six-year-old Jonah Holmes of Spirit Lake, Iowa died Saturday night when the car he was riding in was broadsided by an S-U-V that lost control and crossed the median.  The car's driver, 44-year-old Kevin Bakker of Spirit Lake, and passengers 27-year-old Michelle Holmes and one-year-old Fisher Bakker were taken to Worthington Hospital in critical condition.  The 30-year-old Luverne man driving the S-U-V was treated and released.  Everyone was buckled up and no alcohol was detected.