Question: What is the nationality of the man who defeated an American Olympic champion later killed by John Eleuthere du Pant?

Context paragraphs:
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.  He won the 1987 World Championships, beating Dave Schultz in the final, and placed second in 1986.  Varayev held the European welterweight title in 1986–1988.  After retiring from competitions worked as a wrestling coach and administrator.  He trained the Russian national freestyle team and served as vice-president of the Russian Wrestling Federation.  He accidentally drowned after a bad fall into the Argun River.

Panhandle (film): Panhandle is a 1948 film directed by Lesley Selander.  This Western marked the writing and producing debuts of Blake Edwards and John C. Champion.  Champion later reworked the story as the 1966 Audie Murphy western, "The Texican".  The team of Edwards, Champion, Selander, and star Rod Cameron reteamed the following year for the western "Stampede".  Edwards later produced the police drama "City Detective" starring Cameron.  The series was the first syndicated on television.

Myrging: The Myrgings were a clan and people of Saxon origin who, together with their king Eadgils, are only mentioned in the Old English poem "Widsith".  They are mentioned as the people of the scop Widsith.  They appear to have been the neighbours of the Angles and Offa of Angel, who was involved in a war against them.  Perhaps they were a dynasty or clan competing for power with Offa over the rule of the Angles, though Offa slew two Myrging princes, probably the sons of Eadgils (not to be confused with the Swedish king Eadgils); this Eadgils was later killed by Ket and Wig, the sons of Freawine, a governor of Schleswig who challenged Eadgils to combat while he was pillaging in the Angle lands.  Freawine was killed in combat and the Myrgings may then have overrun Schleswig, as they are said to have settled or had holdings at Schleswig, though they were eventually defeated by Offa, who extended the boundary with them to Fifeldor.

E. Paul du Pont: Eleuthere Paul du Pont (April 24, 1887 – September 26, 1950) was an American industrialist, and the son of Francis Gurney du Pont.  He founded Du Pont Motors, a manufacturer of automobiles and marine engines, and later bought and became President of Indian Motorcycles.  He was inducted into the Motorcycle Hall of Fame in 2004.

Dong Zhang: Dong Zhang (董璋) (d. June 10, 932) was a general of the Chinese Five Dynasties and Ten Kingdoms period states Later Liang and Later Tang.  After submitting to Later Tang after Later Liang's destruction, he became a general favored by both Later Tang's founding emperor Li Cunxu and Li Cunxu's chief of staff Guo Chongtao, causing Guo to commission Dong as the military governor ("Jiedushi") of Dongchuan Circuit (東川, headquartered in modern Mianyang, Sichuan) after Guo's conquest of Former Shu.  Because of this, after Li Cunxu's downfall and succession by his adoptive brother Li Siyuan, Li Siyuan's chief of staff An Chonghui came to suspect both Dong and Meng Zhixiang, the military governor of neighboring Xichuan Circuit (西川, headquartered in modern Chengdu, Sichuan).  Dong and Meng jointly rebelled against Li Siyuan and were successful military, forcing the imperial government to eventually move into a reconciliatory posture.  Dong, however, as his son Dong Guangye (董光業) and Dong Guangye's family were slaughtered, refused the imperial overture, and later launched an attack on Meng, as Meng was moving to reconciliation with the imperial government.  Meng defeated him, and he was later killed by his own subordinates.

Dave Schultz (wrestling): David Leslie "Dave" Schultz (June 6, 1959 – January 26, 1996) was an American Olympic and world champion freestyle wrestler, a seven-time World and Olympic medalist.  He coached individuals and teams at the college level and also privately.  He was shot and killed by John Eleuthère du Pont, a millionaire philanthropist who sponsored the private Foxcatcher wrestling team at an amateur sports center, known as Foxcatcher Farm, he set up on his estate in Pennsylvania.

Delaware Museum of Natural History: The Delaware Museum of Natural History was founded in 1957 by John Eleuthere du Pont near Greenville, Delaware; it opened in 1972 on a site near Winterthur, Delaware.  It is known for its extensive collections of seashells, birds, and bird eggs.  The latter is the second largest collection in North America.  It is the oldest natural history museum in Delaware.

2010 São Paulo FC season: The 2010 football season was São Paulo's 81st season since club's existence.  In this year "Tricolor" take part on its seventh consecutive Copa Libertadores however was defeated at semifinals by Internacional, that would be champion later, on away goal rule due a goal scored by opponent on Morumbi, 0–1 (away); 2–1 (home).  The club came third in Campeonato Paulista losing at semifinals to rival Santos.  In Série A ended in ninth position reaching a qualifying to Copa Sudamericana breaking the sequence of qualification to the Copa Libertadores, since 2004.

Randy Lewis (wrestler): Randall Scott "Randy" Lewis (born June 7, 1959, in Rapid City, South Dakota) is an American wrestler and olympic champion.  He competed at the 1984 Olympic Games in Los Angeles, where he received a gold medal in freestyle featherweight.  After winning three high school state titles in South Dakota, he was a four-time All-American and two-time NCAA champion at the University of Iowa.  A two-time Olympian, and 1984 Olympic champion in Los Angeles.  At Iowa, he was a four-time All-American and two-time NCAA champion.  Was member of 1980 Olympic team but President Jimmy Carter's boycott prevented the U.S. team from traveling to the Games in Moscow.  Won gold medal at 136.5 pounds in freestyle wrestling at 1984 Olympics, outscoring his first four opponents 52-4 to advance to the final, where he crushed Japan's Kosei Akaishi 24-11 in 4:52.  He was second in the 1988 Olympic trials to John Smith, who wound up winning a gold medal.  Lewis was also 1983 Pan American Games champion.

San Yu Htwe: San Yu Htwe (born 14 October 1986) is a female Burmese recurve archer from Mindat.  She competed in the archery competition at the 2016 Summer Olympics in Rio de Janeiro, where she ranked at #51 in the ranking round.  She defeated Taru Kuoppa in the first round and Mackenzie Brown in the second round but lost to the then current Olympic Champion Ki Bo-bae in the third round.  She said that she felt too excited to be competing against the current Olympic Champion that her performance was not as good as she hoped.

Supporting paragraphs: Adlan Varayev Dave Schultz (wrestling)
Answer: Russian-Chechen