Question: Who murdered the American Olympian Dave Schultz?

Context articles: Art Longsjo
Ken Chertow
Gabe Jennings
Jeff Galloway
John du Pont
Taylor Gold
Mary Anne O'Connor
Christian McCaffrey
Dave Schultz (wrestling)
Jay Hakkinen

Arthur "Art" Matthew Longsjo, Jr. (October 23, 1931 – September 16, 1958) was an American Olympian speed skater and cyclist.
 He was the first person to compete in the Summer and Winter Olympics in the same year.
Ken Chertow is an American Olympian wrestler who participated in the 1988 Summer Olympics in Seoul, South Korea, and currently conducts wrestling camps across the United States.
 He serves as a mentor for thousands of young wrestlers whom he coaches in his clinics, camps and Home Training Center in Boalsburg, Pennsylvania.
 In March 2017, he was named head coach of the just-established wrestling program at Queen's University of Charlotte.
Gabe Jennings (born January 25, 1979) is an American Olympian was one of the United States' premier middle distance runners.
 A graduate of Madison (WI) East High School and Stanford University, he is best known for winning the 2000 USA Olympic Trials in the 1500 m with a time of 3:35.90.
 In 2003, after a poor 2002 season in which he failed to live up to the expectations generated by his previous success, Jennings biked from California to Brazil.
Jeff Galloway (born July 12, 1945 in Raleigh, North Carolina) is an American Olympian and the author of "Galloway's Book on Running."
John Eleuthère du Pont (November 22, 1938 – December 9, 2010) was an American philanthropist and heir to the Du Pont family fortune, he had been a published ornithologist, philatelist, philanthropist, conchologist, sports enthusiast, self-styled wrestling coach.
 He died in prison while serving a sentence of 30 years in prison for the murder of Dave Schultz.
Taylor Gold (born November 16, 1993) is an American Olympian snowboarder.
 He competes in the halfpipe.
Mary Anne O'Connor (born October 1, 1953) is an American Olympian who competed in the 1976 Summer Olympics on the first US Olympic women's basketball team.
Christian Jackson McCaffrey (born June 7, 1996) is an American football running back for the Carolina Panthers of the National Football League (NFL).
 He played college football at Stanford, and was drafted by the Panthers with the eighth overall pick in the 2017 NFL Draft.
 As a sophomore in 2015, McCaffrey was the AP College Football Player of the Year and the runner-up for the Heisman Trophy.
 He holds the NCAA record for most all-purpose yards in a season with 3,864.
 He is the son of former Stanford and NFL wide receiver Ed McCaffrey and former Stanford soccer star Lisa McCaffrey, who is the daughter of U.S. Olympian Dave Sime.
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.
Jay William Hakkinen (born July 19, 1977) is a former biathlete.
 He is a four-time American Olympian, and his 10th-place finish in the 20-kilometer individual race at the 2006 Winter Olympics in Turin, Italy was the best finish ever by an American biathlete.