Wordnet 3.0
NOUN (1)
1. 
 a person who is feeling grief (as grieving over someone who has died); 
[syn: mourner, griever, sorrower, lamenter]
WordNet (r) 3.0 (2006):
sorrower
    n 1: a person who is feeling grief (as grieving over someone who
         has died) [syn: mourner, griever, sorrower,
         lamenter]