Question: What is the nationality of the man who defeated an American Olympic champion later killed by John Eleuthere du Pant?
Sentence (from "Adlan Varayev"): Adlan Abuevich Varayev (Russian: Адлан Абуевич Вараев ; 2 January 1962 – 4 May 2016) was a Russian-Chechen welterweight freestyle wrestler who won a silver medal at the 1988 Olympics.
Relevant evidence: Yes