UPDATE 1-Former Fiat Chrysler exec expected to plead guilty in payments probe - sources

DETROIT, Jan 16 (Reuters) - Former Fiat Chrysler Automobiles NV vice president Alphons Iacobelli is expected to plead guilty in connection with a U.S. Justice Department investigation into allegations he made at least $1.2 million in improper payments to a former union vice president and his wife, two people briefed on the matter said on Tuesday.