According to the news outlet, the letters were sent music publicist Michael Vail, a former high school classmate of Oliva's.
Police told DailyMailTV, they are investigating Olivas’ potential involvement.
'We have passed the additional information you provided onto investigators. We will not comment on any actions or the status of this investigation.'
The news comes days after JonBenet’s brother Burke settled a US$750 million lawsuit against CBS.
Last year, Burke slapped the broadcaster with a defamation lawsuit for fingering him as his sister's killer in the 2016 docu-series, The Case of: JonBenet Ramsey.
The case remains officially unsolved, nearly 22 years after JonBenet was discovered in the basement of the family's Boulder, Colorado, home on Christmas Day 1996.
RELATED: Everything you need to know about the case of JonBenet Ramsey