The floppy disk trace that unmasked a church leader as BTK after 30 years

A floppy disk arrived at a Wichita newspaper in 2004, sent by someone claiming to be the BTK killer.

It was a taunt, a piece of plastic from a decade that had already passed.

Police found hidden metadata on the disk—data about the document's creation.

The metadata pointed to a specific computer.

That computer led detectives to a church.

Then it led to a man who served as church council president.

He was also a Cub Scout leader.

He was a compliance officer for animal control, married with children.

His name was Dennis Rader.

The disk was deliberate, a provocation from a killer who had gone silent for years.

It became the key to a case that had gone cold for decades.

The exact contents of the disk's metadata are not specified in the source.

Only that it was traced to a church, and then to Rader.

What else was on that disk?

What did the file say?

What made the killer think it was safe?

That would require evidence the record does not provide.

The disk was mundane.

It was also the hinge on which thirty years turned.

THE FIRST CRIME

January 15, 1974, is the date the police report records.

Four members of the Otero family were found murdered in their Wichita home that day.

The father was Joseph Otero.

His wife was Julie.

Two of their children were also killed.

A third child survived by hiding, according to the case file.

The investigation initially focused on these murders.

Police interviewed neighbors, the police investigation recorded.

Leads went nowhere.

In October 1974, a letter arrived at a Wichita television station.

Police records state the killer claimed responsibility in that letter.

That letter introduced the moniker "BTK."

Over the next 17 years, the killer claimed at least seven more victims.

The case file records taunting letters sent to media and police.

The letters offered clues.

The letters offered photographs.

The letters offered a poem.

The case went cold.

No arrests were made for decades.

Not because the police stopped looking.

But because the leads died out.

What was the killer's name?

What did his face look like?

What connected one murder to the next?

That would require evidence the record did not provide.

The record establishes the Otero murders.

It establishes a letter and a name.

The total number of victims is not specified in the record.

Only that there were at least seven more after the family of four.

The frustration is in the file itself.