
This episode covers the unsolved murders of Tammy Zywicki and Kristen Schmidt, the FBI's Highway Serial Killings Database, and suspects linked to these cases.
The hosts, Nick and Captain, discuss the details surrounding the murder of Tammy Zywicki, who was last seen in 1992. They highlight the FBI's creation of the Highway Serial Killings Database to connect unsolved cases involving victims linked to interstates.
They also examine the potential suspects, including truck driver Bruce Mendenhall, who was convicted of multiple murders of sex workers. Mendenhall's connection to Tammy's case is explored, although DNA evidence has not definitively linked him to her murder.
Lonnie Beardbro, another suspect, is discussed in relation to witness accounts and circumstantial evidence. The hosts express frustration over the lack of resolution in both cases, emphasizing the need for justice.
In addition, the episode touches on the emotional toll on the victims' families and the ongoing efforts to solve these cold cases.
The episode discusses the unsolved murders of Tammy Zywicki and Kristen Schmidt, examining suspects and the FBI's Highway Serial Killings Database.

This episode stands out for the following:
I just want them to find the person who killed our daughter.America’s Highway Serial Killers /// Part 4 /// 593
Losing your kid is every parent's worst nightmare.America’s Highway Serial Killers /// Part 4 /// 593
Tammy has incredibly good judgment; she wouldn't get into a car with a stranger.America’s Highway Serial Killers /// Part 4 /// 593
There's real evil out there, and it lurks everywhere.America’s Highway Serial Killers /// Part 4 /// 593
It seems like there's a pile of evidence piling up.America’s Highway Serial Killers /// Part 4 /// 593
That's too long without any answers.America’s Highway Serial Killers /// Part 4 /// 593