Question: The Frozen Ground was based on the crimes of which American serial killer?

Context paragraphs:
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.

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.

The Frozen Ground: The Frozen Ground is a 2013 American crime thriller drama film directed and written by Scott Walker in his directorial debut, and starring Nicolas Cage, John Cusack, Vanessa Hudgens, Katherine LaNasa, Radha Mitchell and 50 Cent.  Based on the crimes of real-life Alaskan serial killer Robert Hansen, the film depicts an Alaskan State Trooper seeking to apprehend Hansen by partnering with a young woman, who escaped from Hansen's clutches.

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.

Robert Hansen: Robert Christian Hansen (February 15, 1939 – August 21, 2014), known in the media as the "Butcher Baker", was an American serial killer.  Between 1971 and 1983, Hansen abducted, raped and murdered at least 17, and possibly more than 30 women, in and around Anchorage, Alaska, hunting them down in the woods with a Ruger Mini-14 and other weapons.  He was arrested and convicted in 1983 and was sentenced to 461 years with no possibility of parole.

David Berkowitz: David Richard Berkowitz (born Richard David Falco; June 1, 1953), known also as the Son of Sam and the .44 Caliber Killer, is an American serial killer who pled guilty to eight separate shooting attacks that began in New York City during the summer of 1976.  The crimes were perpetrated with a .44 caliber Bulldog revolver.  He killed six people and wounded seven others by July 1977.  As the number of victims increased, Berkowitz eluded the biggest police manhunt in the history of New York City while leaving letters that mocked the police and promised further crimes, which were highly publicized by the press.  The killing spree terrorized New Yorkers and achieved worldwide notoriety.

Topps Meat Company: Topps Meat Company (Topps Meat Company LLC) was a privately owned family company founded in 1940 by Benjamin Sachs in Manhattan, New York.  The company later relocated to Elizabeth, New Jersey.  The company produced and distributed frozen ground beef patties and other meat products processed at its 3000 sqft plant in Elizabeth and posted about $8.8 million a year in sales, according to information reported by Dun & Bradstreet.  In 2003, the company was purchased by Strategic Investment and Holdings, an investment firm based in Buffalo, New York and by 2007 it was "one of the country’s largest manufacturers of frozen hamburgers."  In 2007 the company ceased operations following (E. coli) contamination of products and the ensuing recall.

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.

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.

Randall Woodfield: Randall Brent "Randy" Woodfield (born December 26, 1950) is an American serial killer who was dubbed The I-5 Killer or The I-5 Bandit by the media due to the crimes he committed along the Interstate 5 corridor running through Washington, Oregon, and California.  Before his capture, the I-5 Killer was suspected of multiple sexual assaults and murders.  A native of Oregon, Woodfield was convicted of three murders and is suspected of killing up to 44 people.  He is currently incarcerated at the Oregon State Penitentiary.  In 2011, Woodfield was the subject of a Lifetime television movie "Hunt for the I-5 Killer".  The movie was based on the book "The I-5 Killer" by crime author Ann Rule.

Supporting paragraphs: The Frozen Ground Robert Hansen
Answer: Robert Christian Hansen