The letter, which indicated that the board’s decision was delivered on 11 May, said Cosby should “attend and complete additional institutional programs.”
The board cited Cosby’s “failure to develop a parole release plan” and “a negative recommendation by the Department of Corrections” as factors contributing to the decision.
The letter states that in Cosby’s next interview with the board, it will review and consider whether it has successfully participated in and completed a treatment program for the prevention of sex offenders and violence.
Cosby, according to the letter, must maintain a “clear conduct record”.
Disgraced actor spokesman Andrew Wyatt said the news of the denial was no surprise to Cosby, his family, his friends and his legal team.
“Mr. Cosby has emphatically declared his innocence and continues to deny all allegations leveled against him without evidence. Today, Mr. Cosby hopes the Pennsylvania State Supreme Court will issue an opinion . Wyatt said in a statement to CNN on Thursday, “to vacate his sentence or guarantee him a new trial.”
Cosby was convicted and sentenced in 2018 in the first high-profile celebrity criminal trial of the #MeToo era, following a 2017 mistrial.
CNN’s Eric Levenson contributed to this report.