Rule 615.        Exclusion of Witnesses

At the request of a party the court shall order witnesses

excluded so that they cannot hear the testimony of other

witnesses, and it may make the order of its own motion.  This

rule does not authorize exclusion of (1) a party who is a

natural person, or (2) an officer or employee of a party which

is not a natural person designated as its representative by its

attorney, or (3) a person whose presence is shown by a party

to be essential to the presentation of the party’s cause, or (4)

a person authorized by statute to be present.