The Collaborative International Dictionary of English v.0.48:

Iceman \Ice"man\, n.; pl. Icemen.
   1. A man who is skilled in traveling upon ice, as among
      glaciers.
      [1913 Webster]

   2. One who deals in ice; one who retails or delivers ice.
      [1913 Webster]

WordNet (r) 3.0 (2006):

iceman
    n 1: someone who cuts and delivers ice
    2: a professional killer [syn: hatchet man, iceman]