VESTAVIA HILLS, Ala. — An Alabaster man killed in a multi-vehicle crash on Interstate 459 last week has been identified by the Jefferson County Coroner’s Office. 20-year-old George N. Mathu, of Alabaster, died on Aug. 14 following a crash on I-459 North near mile marker 21 in Vestavia Hills. Mathu was the sole occupant of the vehicle. Upon collision, the vehicle overturned and caught fire, according to eyewitness reports. The accident took place…