Impairment is suspected and a driver of a Mazda SUV has been arrested following a deadly accident involving a CATS Transit bus in northwest Charlotte last week, Charlotte Police said Saturday. An initial investigation revealed the SUV attempted to make a left turn on a I-485 entrance ramp and failed to yield the right of way to the bus. While speed was not a factor for either party involved, 22 year-old Derwin Lewis, the driver of the SUV, was found to be impaired and was arrested and charged with DWI felony death by motor vehicle, the police report indicated.