From A Wiki of Ice and Fire
|Allegiance||Formerly the Night's Watch|
|Born||In 298AL, at the Haunted Forest|
|Book(s)||A Game of Thrones|
|TV series||Season 1|
He was a big, ugly man whose eyes turned blue as a Wight.
A Game of Thrones
Othor was a member of the ranging party commanded by Benjen Stark. Jon Snow found his corpse in the Haunted Forest when he went to say his vows beneath the weirwoods. His corpse was brought back to Castle Black. Reanimated as a Wight, he sought out and attempted to kill Lord Commander Mormont but was stopped by a fire started by Jon Snow.
A Clash of Kings
His hand (still moving) was sent to King's Landing in a jar with Alliser Thorne to try to scare the King into sending more troops to the wall. Tyrion Lannister kept Ser Allister waiting so long that Othor's hand decomposed, and was not very convincing. 
|“||"And might be I’m a fool, but I don’t know that Othor never had no blue eyes afore." ||”|