Source : Webster's Revised Unabridged Dictionary (1913)

Stalker \Stalk"er\, n.
   1. One who stalks.

   2. A kind of fishing net.

Source : WordNet®

stalker
     n 1: someone who walks with long stiff strides
     2: someone who stalks game
     3: someone who prowls or sneaks about; usually with unlawful
        intentions [syn: {prowler}, {sneak}]