Question: Which former American football player, who was an NFL safety for nine seasons, is closely associated with the horse-collar tackle?
Context: Randall Charles Dixon (born March 12, 1965) is a former American college and professional football player who was a tackle in the National Football League (NFL) for nine seasons during the 1980s and 1990s.  Dixon played college football for the University of Pittsburgh, and thereafter played professionally for the Indianapolis Colts of the NFL. Husain Ibn Muhammed Abdullah (born July 27, 1985) is a former American football free safety.  He was signed by the Minnesota Vikings of the National Football League (NFL) as an undrafted free agent in 2008 and also played for the Kansas City Chiefs.  He retired from the NFL after seven seasons due to multiple concussions sustained during his career and concern for his future health.  Abdullah played college football at Washington State.  He is the younger brother of former NFL safety Hamza Abdullah. Rodney Dejuane Thomas (March 30, 1973 – June 14, 2014) was a professional American football player who played running back for seven seasons for the Houston Oilers/Tennessee Titans, and Atlanta Falcons.  Thomas was the cousin of former NFL safety Terrence Kiel. Roy Lee Williams (born August 14, 1980), is a former American college and professional football player who was a safety in the National Football League (NFL) for nine seasons.  He played college football for the University of Oklahoma, and was recognized as a unanimous All-American.  He was drafted by the Dallas Cowboys eighth overall in the 2002 NFL Draft, and played professionally for the Cowboys and Cincinnati Bengals.  He earned five straight Pro Bowl selections from 2003 to 2007.  Williams is currently a sideline reporter for Oklahoma football games. The horse-collar tackle is an American football maneuver in which a defender tackles another player by grabbing the back collar or the back-inside of an opponent's shoulder pads and pulling the ball carrier directly downward in order to pull his feet from underneath him.  The technique is most closely associated with Pro Bowl safety Roy Williams.  This kind of tackle was banned from the NFL during the 2005 off-season.  The rule forbidding it is often referred to in the press as "The Roy Williams Rule".  The rule, with modifications, was adopted in college football in 2008 and high school football in 2009. Merton Edward Hanks (born March 12, 1968) is a former American football player who was a safety in the National Football League (NFL) for nine seasons during the 1990s.  He is currently the NFL Vice President of Operations. William Montae Reagor ( ; born June 29, 1977) is a former American college and professional football player who was a defensive tackle in the National Football League (NFL) for nine seasons.  He played college football for Texas Tech University, and he was recognized as an All-American.  he was drafted by the Denver Broncos in the second round of the 1999 NFL Draft, and played professionally for the Broncos, Indianapolis Colts and Philadelphia Eagles of the NFL.  Reagor is currently a coaching intern for the Eagles. Richard Paul Anderson (born February 10, 1946) is a former American college and professional football player who was a safety for the Miami Dolphins of the American Football League (AFL) and National Football League (NFL) for nine seasons during the 1960s and 1970s.  He played college football for the University of Colorado, and was recognized as a consensus All-American.  He was selected in third round of the 1968 AFL Draft, and he played for his entire professional career for the Dolphins. Roderick Dwayne Coleman (born August 16, 1976) is a former American football defensive tackle who played nine seasons in the National Football League (NFL).  He played college football at East Carolina University.  He was drafted by the Oakland Raiders in the fifth round of the 1999 NFL Draft, and has also played for the NFL's Atlanta Falcons and New Orleans Saints. Harvey Jerome Clayton (born April 4, 1961) is a former professional American football player who played cornerback for five seasons for the Pittsburgh Steelers and New York Giants.  Clayton is the uncle of NFL Safety Antrel Rolle.
Answer: Roy Williams