Question: Quietly Confident Quartet consisted of the freestyler whose career ended after what event?

Context paragraphs:
Frank Crossin: Francis Patrick "Frank" Crossin, Sr. (June 15, 1891 – December 6, 1965) was a professional baseball player whose career spanned seven seasons, three of which were spent in Major League Baseball (MLB) St. Louis Browns (1912–14).  Over his Major League career, Crossin, a catcher, compiled a .147 batting average with eight runs scored, 17 hits, one double, one triple, and seven runs batted in (RBIs) in 55 games played.  He made his professional debut with the minor league Binghamton Bingoes in 1912.  His MLB debut came on September 24, 1912.  Crossin played parts of the next two seasons in the majors.  In 1915, a year after his MLB career ended, he returned to the minors.  Over his career in the minors, Crossin compiled a .261 batting average with 303 hits in 381 games played.  He batted, and threw right-handed.  During his career, he stood at 5 ft , and weighed 160 lb .

Quietly Confident Quartet: The Quietly Confident Quartet was the self-given name of the Australian men's 4 × 100 metres medley relay swimming team that won the gold medal at the 1980 Summer Olympics in Moscow.  The United States boycotted the Moscow Olympics in protest against the Soviet invasion of Afghanistan and, through the 2016 Olympics, the Australian victory remains the only occasion the United States has not won the event at Olympic level since its inception in 1960.  The quartet consisted of backstroker Mark Kerry, breaststroker Peter Evans, butterflyer Mark Tonelli and freestyler Neil Brooks.  The team was nominally led by its oldest member Tonelli, who was 23 and was also a spokesperson for the Australian athletes' campaign for their right to compete at the Olympics against the wishes of the Fraser Government.  The team was seen as an unlikely prospect to win; all four of the swimmers had clashed with swimming authorities over disciplinary issues and three experienced suspension or expulsion from the Australian team during their careers.

Michelle Smith: Michelle Smith de Bruin (born 16 December 1969 in Rathcoole, County Dublin) is a retired Irish swimmer who achieved notable success in the 1996 Summer Olympics in Atlanta, becoming Ireland's most successful Olympian to date, and whose career ended with a ban from the sporting authorities for tampering with a urine sample.  She was a triple gold medallist at the Atlanta Games, for the 400 m individual medley, 400 m freestyle and 200 m individual medley, and also won the bronze medal for the 200 m butterfly event: these events were marked by allegations of doping which were, however, never proven.  Michelle Smith, now more commonly referred to by her married name, Michelle Smith de Bruin, is currently a practising barrister.

Schmitt Brothers: Schmitt Brothers was a Barbershop quartet from Two Rivers, Wisconsin that won the 1951 SPEBSQSA international competition.  The quartet consisted of four brothers: Joe, Paul, Francis and Jim Schmitt.  They participated in 110 performances during their championship year, including appearances on the Ed Sullivan and Arthur Godfrey television programs.

L8R (band): L8R (pronounced "later") was Norway's first boyband.  The quartet consisted of teenagers Ray David (Raymond David Henriksen), Erik Kinn (Knut Eirik Kokkin), Kif Flinder (Christopher Flinder Petersen) and Chris Jensen (Christoffer Jensen).

Peter Evans (swimmer): Peter Maxwell Evans (born 1 August 1961) is an Australian breaststroke swimmer of the 1980s who won four Olympic medals, including a gold in the 4×100 m medley relay at the 1980 Moscow Olympics as part of the Quietly Confident Quartet.  He also won consecutive bronze medals in the 100 m breaststroke at the 1980 Olympics and the 1984 Los Angeles Olympics.

Mark Kerry: Mark Anthony Kerry (born 4 August 1959) is an Australian former backstroke and freestyle swimmer of the 1970s and 1980s, who won three Olympic medals, including a gold in the 4 × 100 m medley relay at the 1980 Summer Olympics as the backstroker for the "Quietly Confident Quartet".  During his career, he won twelve Australian Championships.

Neil Brooks: Neil Brooks (born 27 July 1962) is an Australian former sprint freestyle swimmer best known for winning the 4 × 100 m medley relay at the 1980 Olympics in Moscow as part of the "Quietly Confident Quartet".  Brooks was as much known for his swimming achievements as he was for disciplinary incidents.  He often found himself in conflict with officialdom and threatened with sanctions.  His international career ended when he was suspended for drinking 46 cans of beer on the return flight to Australia after the 1986 Commonwealth Games.  In retirement, he became a news presenter and sports commentator, but was fired amid alcohol problems.

Budapest String Quartet: The Budapest String Quartet was a string quartet in existence from 1917 to 1967.  It originally consisted of three Hungarians and a Dutchman; at the end, the quartet consisted of four Russians.  A number of recordings were made for HMV/Victor through 1938; from 1940 through 1967 it recorded for Columbia Records.  Additionally, several of the Quartet's live performances were recorded, at the Library of Congress and other venues.

Mark Tonelli: Mark Lyndon Tonelli (born 13 April 1957), whose birth name was Mark Lyndon Leembruggen, is an Australian former backstroke, butterfly, and freestyle swimmer of the 1970s and 1980s, who won a gold in the 4×100-metre medley relay at the 1980 Moscow Olympics as a makeshift butterfly swimmer in the self-named "Quietly Confident Quartet".  Tonelli unofficially led the relay team and was an athletes' spokesperson who fought for the right of Australian Olympians to compete in the face of a government call for a boycott to protest against the Soviet invasion of Afghanistan.

Supporting paragraphs: Quietly Confident Quartet Neil Brooks
Answer: 1986 Commonwealth Games