Advertized on the October 1982 Releases Flyer, along with Fergus.
The base says Ral Partha, and it's a conversion of one of Tom Meier's sculpts, who was working with Citadel at the time.
Sculptor:
Tom Meier
Painter:
Roy Scorer
Source:
Sue Kesby (baggie)
Skeleton Guardsman in Bag
October 1982 Releases Flyer