Renneyn was a Clawdite from Zolan in the Zolan system. In 2 BBY, Renneyn discovered that he had developed Zithrom's Disease, which was a kidney disorder that usually affected elderly Human males. Unable to get any Clondex, which postponed the disease, he eventually died in 1 ABY, three years after his initial diagnosis.
Sources
"The University of Sanbra Guide to Intelligent Life: The Clawdites" — Star Wars Gamer 10 (First mentioned)- The Official Star Wars Fact File 49 CLA 1-4: Clawdites