Murderland - 99% Invisible Recap

Podcast: 99% Invisible

Published: 2025-11-25

Duration: 28 min

Guests: Caroline Fraser

Summary

Caroline Fraser explores the connection between environmental pollution and serial killing in her book 'Murderland', focusing on the impact of toxic exposure in the Pacific Northwest during the 1970s and 80s.

What Happened

Caroline Fraser grew up on Mercer Island, Washington, which was marked by a series of tragic deaths, including those committed by serial killer Ted Bundy. She was haunted by these memories and later discovered a potential link between environmental pollution and violent crime. The region was heavily impacted by industrial pollution, particularly from the Asarco smelter in Tacoma, which released large amounts of lead and arsenic into the environment.

Fraser's book 'Murderland' intertwines true crime, memoir, and environmental history, proposing that exposure to environmental toxins might be linked to the rise of serial killings during that time. She discusses how the Asarco smelter's pollution spread across the region, as shown by a GIS map published by the U.S. Department of the Interior, which she discovered in 2014.

Caroline was inspired to investigate the potential connection between environmental factors and serial killers after learning about the lead-crime hypothesis, which suggests that lead exposure can lead to increased aggression and violent behavior. Notably, serial killers Ted Bundy and Gary Ridgway grew up in the Tacoma area, which was heavily polluted by the smelter.

Fraser also draws parallels between the behavior of corporations like Asarco and serial killers, noting the lack of accountability and the lengths to which companies would go to protect themselves from liability, despite the harm they caused to communities. She argues that the behavior of these companies mirrored the sociopathic tendencies of the criminals in her book.

The episode also discusses the infamous Mercer Island Floating Bridge, which was plagued by design flaws that led to numerous fatal accidents. Fraser uses the bridge as a metaphor for the unintended consequences of human error and the failure to address known dangers in infrastructure.

As both the Asarco plant and the bridge were eventually dismantled, Fraser notes a coinciding decline in serial killings, which she attributes in part to the reduction of environmental toxins like lead following regulatory changes in the 1980s and 90s. She acknowledges that while her conclusions are speculative, they offer a compelling narrative that connects environmental and social factors to violent crime.

Fraser concludes with a reflection on the complexity of causation in serial killings, emphasizing the need to consider multiple factors, including genetics, trauma, and environmental influences. Her work challenges readers to reconsider the impact of industrial pollution on public health and safety.

Key Insights