"I’m gonna go with Dennis Rader aka BTK Killer. This serial killer basically got away with murdering many people in the 70s and 80s, “retired”, but then sometime around 2005 some journalist began writing a book about BTK.

Rader did not like that. To him, his sick dream was to go to a random library and leave proof that he was BTK in this book of drawings/collections/admissions he made and that he hoped someone would find years after he was dead, whereupon he would forever be talked about. In BTK’s mind, the author was taking his own story away from him. So Rader came out of retirement, posting random letters and leaving strange packages in town announcing his imminent return, and writing to newspapers that BTK was back and would kill again.

Ah, but this wasn’t the 70s/80s anymore. Now there were security cameras in more places and one spotted a figure leave one of the packages before driving off in a black Jeep Cherokee. Also Rader communicated with police that he would rather send them a disk with a Word document saved on it (they assured him it was impossible to track anything from a disk) than send letters. It was 2005 after all.

That was a lie. When they got the disk, they searched the meta data and found “Christ Lutheran Church” and the document was last saved by someone named “Dennis”. A quick search on the ol’ Internet revealed Dennis Rader used to be president of the f@#kin’ church council! Police then drove by his address and HELLO: black Jeep Cherokee parked in the driveway.

Before they moved in for the arrest, they took DNA (again, DNA analysis not available in 70s/80s). Taking blood that was earlier procured from under the fingernails of one of his victims when she scratched him, they then obtained a warrant to use Rader’s daughter’s pap smear test as a comparison.

The family match was confirmed. Police swarmed Rader’s block and arrested him without incident. He confessed to things immediately but seemed hurt that police lied to him about tracking someone down with a computer disk, to which one detective incredulously replied, “You’re a serial killer and we were trying to catch you.”"