"I killed JonBenet Ramsey!"

Oliva does not explain in the letters why he was at the Ramsey home that night but investigations have shown he was using an address just ten blocks away at the time JonBenét was murdered.

Sexual predator Oliva wrote the letters to Vail from his cell in Limon Correctional Facility, Colorado after being arrested in 2016 for possessing child pornography on his phone.

DailyMailTV has obtained a redacted police report for his 2016 arrest which shows Oliva also had hundreds of photos of JonBenét on his phone when it was seized.