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Springdale Police Lt. Karl Martens turns the key, presses the brake, and his truck erupts. He survives. The case nearly disappears.

On February 24, 1972, someone tried to kill a police lieutenant in Springdale, Arkansas, with a bomb planted beneath his vehicle. More than fifty years later, no one has ever been convicted.

We set out to understand what happened, why the bombing received so little lasting attention, and what the surviving records can still tell us. Along the way, the story opens into a very different Northwest Arkansas, a rural region on the edge of enormous change, where Walmart and Tyson were still rising, Sundays went quiet, and a hard-edged drug trade was beginning to take hold.

Read the full investigation, including law-enforcement records, newspaper coverage, photographs, and additional details from the Karl Martens case:

https://www.paulgnewton.com/blog/1972-springdale-arkansas-police-bombing-karl-martens

We examine the bomb itself, including DuPont gelatin dynamite, electric blasting caps, and evidence suggesting a brake-triggered device. We also follow the investigative trail as the ATF, FBI, and local law enforcement tried to determine where the explosives came from and who had the knowledge, access, and motive to use them.

The names begin to matter. Investigators encountered a farmhand with access to explosives and repeatedly crossed paths with Dennis Eugene Cortis, a man with an extensive criminal history whose name continued to surface in connection with drugs, violence, and the people surrounding the investigation. Witnesses described loose talk, strange remarks, old grudges, and connections that were difficult to ignore but even harder to turn into a prosecutable case.

The surviving records do not offer a tidy answer. FOIA requests produced investigative reports, lab material, interviews, newspaper accounts, and fragments of a case that once involved multiple agencies. Leads were pursued. Evidence was collected. Suspects were questioned. Yet somewhere between what investigators believed and what prosecutors could prove, the case lost momentum.

Then the story takes another turn. Years later, Cortis escaped from the Washington County Jail after receiving help that included tools used to get him out. His mother became part of that chapter, and the escape added another bizarre episode to the life of a man whose name had already become entangled with the Martens investigation.

What remains is not a solved case, and this episode does not pretend otherwise. It is a reconstruction of what the surviving evidence, contemporary reporting, public records, and people familiar with the investigation can still tell us.

This is Arkansas true crime without the clean ending: a police bombing, explosives, meth networks, ATF records, jail escapes, old newspaper clippings, missing pieces, competing accounts, and one stubborn question that has survived for more than half a century.

Who tried to kill Lt. Karl Martens, and why did the case never reach a courtroom?

Listen to the episode, then read the full investigation and decide what the evidence tells you.

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