Question: Which NFL coach served as a linebackers coach for the San Francisco 49ers before being named interim head coach in their 60th season in the NFL?

Context paragraphs:
2016 San Francisco 49ers season: The 2016 San Francisco 49ers season was the franchise's 67th season in the National Football League, the 71st overall, the third playing its home games at Levi's Stadium, and the only season under head coach Chip Kelly.  The season saw the 49ers attempting to rebound from their 5–11 record the previous year.  However, this season would prove to be even worse than the previous, as the 49ers finished 2–14, with their only wins coming against their arch-rival Los Angeles Rams.  The 49ers' record is their worst since 2004, when they also finished 2–14 (both wins were against the Arizona Cardinals).  The 49ers' 1–7 home record tied the worst home record in franchise history (not including the strike shortened 1982 season).  As a result, the 49ers fired head coach Chip Kelly and general manager Trent Baalke.

Ruffin McNeill: Ruffin Horne McNeill Jr. (born October 8, 1958) is an American football coach and former player.  He is currently the assistant head coach and defensive tackles coach at the University of Oklahoma.  He was previously the assistant head coach and defensive line coach at the University of Virginia.  McNeill also served as the head coach of the East Carolina Pirates from 2010 to 2015.  Before being named head coach of the Pirates, McNeill served the Texas Tech Red Raiders as an interim head coach, assistant head coach, special teams coordinator, and linebackers coach.  On December 28, 2009, he was named interim head coach of the Red Raiders following the suspension and later firing of head coach Mike Leach.  He served in the position until the hiring of Tommy Tuberville, who subsequently released him as defensive coordinator.

Vic Fangio: Victor John Fangio (born August 22, 1958) is an American football coach who is currently the defensive coordinator and outside linebackers coach for the Chicago Bears of the National Football League (NFL).  Prior to the Bears, Fangio was defensive coordinator for San Francisco 49ers, the Stanford Cardinal, linebackers coach for the Baltimore Ravens and defensive coordinator for the Houston Texans, Indianapolis Colts, and Carolina Panthers.

List of San Francisco 49ers head coaches: There have been 19 head coaches in the history of the San Francisco 49ers professional football franchise.  The San Francisco 49ers franchise was formed in 1946 as a charter member of the All-America Football Conference (AAFC) before joining the National Football League (NFL) in 1950 after the AAFC merger with the NFL.  Buck Shaw became the first head coach of the 49ers in 1946, serving for nine seasons—four in the AAFC and five in the NFL.  He coached a number of future College and Pro Football Hall of Famers, such as Frankie Albert, Joe Perry, Leo Nomellini, Y. A. Tittle, Bob St. Clair and Hugh McElhenny.  In terms of tenure, Bill Walsh has coached more games (152) and more complete seasons (10) than any other head coach in 49ers franchise history.  He led the 49ers to playoff appearances in seven seasons, three of which led to the Super Bowl championship, in 1981, 1984 and 1988.  Jerry Rice, Joe Montana, Charles Haley, Ronnie Lott, Johnny Davis, Roger Craig, Fred Dean and Steve Young are among the players Walsh has coached in his career.

Mike Singletary: Michael Singletary (born October 9, 1958) is an American football coach and former professional football player.  After playing college football for Baylor University, Singletary was drafted by the Chicago Bears in the 2nd round of the 1981 NFL Draft and was known as "The Heart of the Defense" for the Chicago Bears' Monsters of the Midway in the mid-1980s.  He was inducted into the Pro Football Hall of Fame in 1998.  Singletary later pursued a career as a coach, first as a linebackers coach for the Baltimore Ravens, then as the linebackers coach for the San Francisco 49ers.  In 2008, the 49ers promoted Singletary to the head coaching position after previous head coach Mike Nolan was fired during the season, and he remained in that position until he was fired after the 49ers were eliminated from the playoffs with one game remaining in the 2010 season.

2012 New Orleans Saints season: The 2012 New Orleans Saints season was the franchise's 46th season in the National Football League, and the 37th with home games at the Superdome.  It "was" going to be the seventh season under head coach Sean Payton; however, he was suspended by the NFL for the entire 2012 season as part of the punishment for the team's bounty scandal.  On April 12, 2012, linebackers coach Joe Vitt was named interim head coach to replace Sean Payton while he served his one-year suspension.  On August 22, 2012, it was announced that Aaron Kromer would take over while Vitt himself served a six-game suspension to start the regular season.  The Saints attempted to make history as the first host team to play the Super Bowl on their own home field, but they were eliminated from post-season contention in Week 16.  The Saints set an NFL record for most yards given up by a defense, 7,042 yards, surpassing the 1981 Baltimore Colts record of 6,793 yards.

Ken Norton Jr.: Kenneth Howard Norton Jr. (born September 29, 1966) is an American football coach and former player who is currently the defensive coordinator for the Oakland Raiders of the National Football League (NFL).  Norton played college football for the University of California, Los Angeles (UCLA), and received All-American honors.  He was drafted in the second round of the 1987 NFL Draft, and played thirteen seasons for the NFL's Dallas Cowboys and San Francisco 49ers.  He has previously served as the linebackers coach and the assistant head coach for the University of Southern California , then the linebackers coach for the Seattle Seahawks of the NFL.

Jerry Azzinaro: Jerry Azzinaro is an American football defensive line coach of the San Francisco 49ers of the National Football League (NFL).  He played college football at American International College (AIC) and became a graduate assistant for the team in 1982.  He was the linebackers and running backs coach for Westfield State in 1985, and he was the head coach for Western New England University in 1986.  He was the defensive coordinator for AIC from 1987 to 1991, before becoming the linebackers coach and recruiting coordinator for Massachusetts in 1992.  Azzinaro was promoted to defensive coordinator for the Minutemen in 1994, and subsequently moved on to Boston College as the team's defensive line coach in 1995.  He was rehired by UMass in 1997 to be their defensive coordinator.

2011 San Francisco 49ers season: The 2011 San Francisco 49ers season was the franchise's 66th season overall, and 62nd in the National Football League (NFL).  It is the first season under head coach Jim Harbaugh and general manager Trent Baalke.  The 49ers rebounded from their disappointing 2010 season to end their streak of eight consecutive non-winning seasons.  After defeating the St. Louis Rams in week 13 and attaining a 10–2 record, the team clinched the NFC West and made their first playoff appearance since 2002 (under head coach Steve Mariucci).  The 49ers ended the regular season with a 13–3 record, their best since 1997 and earned a bye in the first round of the playoffs.  In the Divisional Playoffs they defeated the New Orleans Saints 36–32 and were in the NFC Championship for the first time since 1997 where they lost against the New York Giants 20–17 in overtime, coming just short of returning to the Super Bowl for the first time since 1994.  Despite their most successful season in years, the 49ers were 31st in the league in third down conversion percentage in the regular season (29.1) and were 17.9 percent in the playoffs.

2009 San Francisco 49ers season: The 2009 San Francisco 49ers season was the franchise's 64th season, 60th in the National Football League, and the first full year with Mike Singletary as head coach after being named interim head coach in 2008.  It is the seventh year in which the 49ers have their seventh offensive coordinator.  They were looking to improve upon their 7–9 record from 2008 with the 10th overall pick in the 2009 NFL Draft,

Supporting paragraphs: 2009 San Francisco 49ers season Mike Singletary
Answer: Mike Singletary