Bob Sands

So that was his first takeaway, the way the car had gone from the right to the left-hand side of the road. That didn't mesh with the highway patrol's sleepy driver theory.

So that was his first takeaway, the way the car had gone from the right to the left-hand side of the road. That didn't mesh with the highway patrol's sleepy driver theory.

Now, there were other dings on Karen's car. She'd been in a minor accident a couple of weeks earlier that damaged her right rear taillight. But what interested Pipkin was on the left. The dent on the bumper was about two inches long and less than an inch wide.

Now, there were other dings on Karen's car. She'd been in a minor accident a couple of weeks earlier that damaged her right rear taillight. But what interested Pipkin was on the left. The dent on the bumper was about two inches long and less than an inch wide.

Ted Sebring, the tow truck driver, said he was confident he didn't dent the car. And when Pipkin had outside experts look at the dent under a microscope, They didn't find any traces of concrete. Neither did the FBI, though the agency still thought it was possible the dent could have been caused after the crash. But there was something else wedged into one of the dents. Metal particles.

Ted Sebring, the tow truck driver, said he was confident he didn't dent the car. And when Pipkin had outside experts look at the dent under a microscope, They didn't find any traces of concrete. Neither did the FBI, though the agency still thought it was possible the dent could have been caused after the crash. But there was something else wedged into one of the dents. Metal particles.

And Pipkin thought those particles could possibly have come from another vehicle.

And Pipkin thought those particles could possibly have come from another vehicle.

So Pipkin's puzzle was complete. And the picture he saw looked different from the Oklahoma State Highway Patrol's explanation of the crash. Here's what he told ABC about his findings.

So Pipkin's puzzle was complete. And the picture he saw looked different from the Oklahoma State Highway Patrol's explanation of the crash. Here's what he told ABC about his findings.

Pipkin's evidence suggested that a second car could have hit Karen from behind. On November 18th, five days after Karen's death, Pipkin called Steve and his bosses to report his findings. He told them the same thing he later told National Public Radio.

Pipkin's evidence suggested that a second car could have hit Karen from behind. On November 18th, five days after Karen's death, Pipkin called Steve and his bosses to report his findings. He told them the same thing he later told National Public Radio.

The LCAW immediately sent a telegram to the U.S. Attorney General and to the Atomic Energy Commission, or AEC, demanding an investigation.

The LCAW immediately sent a telegram to the U.S. Attorney General and to the Atomic Energy Commission, or AEC, demanding an investigation.

The medication? It was those Quaaludes Karen had been prescribed to help her sleep. The state medical examiner said that she was probably under the influence of them when she crashed. Fagan would later say in a deposition that two of Karen's coworkers had told him she'd been, quote, exhausted, unable to sleep, very fatigued.

The medication? It was those Quaaludes Karen had been prescribed to help her sleep. The state medical examiner said that she was probably under the influence of them when she crashed. Fagan would later say in a deposition that two of Karen's coworkers had told him she'd been, quote, exhausted, unable to sleep, very fatigued.

But Fagan's account didn't square with another important eyewitness. As you heard earlier in the series, Karen's co-worker and friend Gene Young had also been at the union meeting that night. As far as we know, she was the last person to see Karen alive.

But Fagan's account didn't square with another important eyewitness. As you heard earlier in the series, Karen's co-worker and friend Gene Young had also been at the union meeting that night. As far as we know, she was the last person to see Karen alive.

Media reports after Karen's death also challenged the idea that her medication would have put her to sleep.

Media reports after Karen's death also challenged the idea that her medication would have put her to sleep.