Aly Vander Hayden

The agent's emails contained a "very unusual type of writing and attitude from someone that would be a federal investigator of any sort."

"To understand the artist, you must look at the artwork," said FBI Special Agent John Douglas.

After enduring years of abuse from his mother, Ed Kemper started murdering co-eds to feel like "he had power."

From mutilating dolls to killing animals, Ed Kemper's childhood was twisted.

When pressed for details about how he knew it was gang initiation, he said, "Well, I know they was tortured."

The inmate told reporter Stephanie Bauer that "a garage or some kind of structure" had been burned down to hide the evidence.

A "quiet and unassuming" boy, Dennis Rader later fantasized about "trapped and helpless" women.

The inmate said he overheard a fellow convict claim that "Crystal wasn't in Bardstown."

"I knew I seen something," said the witness.

While searching Dennis Rader's property, authorities found a treasure trove of photographs.