An arrest has been made in the disappearance of a Medicine Hat woman.  Amy Lenora Lewis, 23, last spoke with loved ones on Monday.  Her vehicle was found in the parking lot of a motel on Thursday.  The investigation has led to the arrest of 34-year-old Jerrison Herve Stopanski, who faces a charge of accessory after the fact to murder.  More charges are anticipated.  Investigators haven't found Lewis but now "strongly believe" foul play is the cause of her disappearance, and are now searching an area around the South Saskatchewan River, which runs through the city, for evidence in the case.  Anyone with information on the case is asked to call police or Crimestoppers.