Question: William Bonin, an American Serial Killer was also known as the what?

Context paragraphs:
Gary Ridgway: Gary Leon Ridgway (born February 18, 1949) is an American serial killer known as the Green River Killer.  He was initially convicted of 48 separate murders and is presumed to be responsible for more than 90.  As part of his plea bargain, an additional conviction was added, bringing the total number of convictions to 49, making him the most prolific American serial killer in history according to confirmed murders.  He murdered numerous women and girls in Washington State during the 1980s and 1990s.

William Bonin: William George Bonin (January 8, 1947 – February 23, 1996) was an American serial killer and twice-paroled sex offender, also known as the Freeway Killer, who committed the rape, torture and murder of a minimum of 21 boys and young men in a series of killings in 1979 and 1980 in southern California.  Bonin is also suspected of committing a further fifteen murders.

David Meirhofer: David G. Meirhofer (June 8, 1949 – September 29, 1974) was an American serial killer who committed four murders in rural Montana between 1967 and 1974 — three of them children.  At the time, the Federal Bureau of Investigation was developing a new method of tracking killers called offender profiling, and Meirhofer was the first serial killer to be investigated using the technique.  Offender profiling is a method used to learn clues about the characteristics of an unknown killer from evidence at the scene of the crime and establish their behavioural patterns before they reach the height of their criminality.

Freeway Killer (film): Freeway Killer is a 2010 horror film directed by John Morlowski and written by David Birke starring Scott Anthony Leet, Cole Williams, Dusty Sorg, Michael Rooker, Debbon Ayer, and Eileen Dietz.  The film is based on true events and follows the story of serial killer William Bonin, one of three killers who claimed several victims on the freeways of California in the 1970s and 1980s.  The film was released by Image Entertainment on February 16, 2010.

Harvey Miguel Robinson: Harvey Miguel Robinson (born December 6, 1974) is an American serial killer who is a prisoner on death row in Pennsylvania.  He is one of the youngest serial killers in American history.  He was 18 years old when he was apprehended for his crimes.  He is also the first serial killer in the history of Allentown, Pennsylvania.

Patrick Kearney: Patrick Wayne Kearney (born September 24, 1939) is an American serial killer who preyed on young men in California during the 1970s.  He is sometimes referred to as "The Freeway Killer", a nickname he shares with two other – separate – serial killers, William Bonin and Randy Steven Kraft.  Kearney may be among the most prolific serial killers in United States history, claiming possibly as many as 43 victims according to law enforcement.

Daytona Beach killer: The Daytona Beach killer is an American serial killer responsible for the murders of four women in the Daytona Beach, Florida area from December 2005 to December 2007.  The killer has never been apprehended.  The involvement of a serial killer was feared after the discovery of the first three victims.

Bundy: An American Icon: Bundy: An American Icon (aka Bundy: A Legacy of Evil) is a 2008 horror film depicting the criminal career of American serial killer, Ted Bundy.  It was directed by Michael Feifer serial killer biopics, and starred Corin Nemec from "Parker Lewis Can't Lose".

Mark Goudeau: Mark Goudeau (born September 6, 1964) is an American serial killer and rapist.  Goudeau was involved in one of the two simultaneously occurring serial killer cases (the other being the "Serial Shooter") which terrorized the Phoenix metro area, between August 2005 and June 2006.

Derrick Todd Lee: Derrick Todd Lee (November 5, 1968 – January 21, 2016), also known as the Baton Rouge Serial Killer, was an American serial killer.  His killing spree began in 1992 and ended in 2003, and claimed the lives of seven women.

Supporting paragraphs: Patrick Kearney William Bonin
Answer: the Freeway Killer