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The Bear Brook murders (aka the Allenstown Four) are four female American murder victims, discovered in 1985 and 2000, at Bear Brook State Park in Allenstown, New Hampshire. The four victims were estimated to have died between 1977 and 1981. Thus begins the criminal investigation that will span decades as police investigators and "armchair detectives" eventually discover the perpetrator of these crimes, Terry Peder Rasmussen, who has been dubbed The Chameleon Killer.

With the advent of DNA profiling, police detectives and "Internet sleuths" narrow down the pool of suspects, eventually pinning the murders on Terry Peder Rasmussen, The Chameleon Killer, who is also tied to a fifth victim in California. Terry Peder Rasmussen is jailed for his crimes and dies in prison on December 28, 2010.