This episode contains descriptions of violence and sexual assault.

Use your best judgment.

On August 20, 1986, a post office employee killed 14 people in Edmund, a suburb of Oklahoma City.

The man went back and forth with the police

until finally turning his gun on himself.

As you can imagine,

a lot of manpower went into the investigation of that case,

and the incident itself was broadcasted on all the news outlets.

Four days earlier, on August 16th, a different tragic crime had taken place in

Edmund. Gary Larson had been murdered in his own home, and his fiancé was raped repeatedly,

but she survived. Every detective that had been assigned to solve Gary Larson's murder

was diverted to the postal shooting just four days later.

By the time the detectives were finishing the postal case paperwork,

the witnesses and other possible leads to the man who attacked Gary and his fiance were practically non-existent. It took 18 years to make up for the delayed investigation,

and to finally arrest Gary Larson's killer.

From A&E, this is Cold Case Files.

I'm Brooke, and here's the legendary Bill Curtis with a classic case, The Peeper.

It was obviously starting to slow down because we were getting into those morning hours.

Officer Steve Day works the graveyard shift in Edmond, Oklahoma.

Just before 6 a.m., a call comes over his radio.

The dispatcher told me it was possibly a DOA, which made me think, well, obviously,

sounds like pretty serious.

...