"He has a serious history of violence and sex offending in his past prior to his 1992 imprisonment," Parole Board chairman Sir Ron Young said.
"We saw him last in December 2019.
"At that stage he had seen a private psychologist no further rehabilitation was required but he needed detailed release planning.
"The concern was he had no real support in the community other than professional support."
At a hearing in May, the board heard Davis had completed three guided releases from prison but his safety plan was dated in 2005 and the address he was proposing to move to was not somewhere he had ever lived.
"He has very little support in the community but it is true to say that there is no realistic prospect of him improving his personal support from prison given he has been in prison for 28 years and that he does not have any background or history in the area where he proposes to be released," Sir Ron said.
Davis told the board he had "some ideas" about what he might do if he was to be released to the area he was seeking approval for.
"He talked about providing help and support ... and as well he had a number of other ideas for community involvement through groups relevant to his own age," Sir Ron explained in the parole decision released recently.
"He talked briefly to us about the need to stay away from young children and families relating to his high-risk situations.
"He showed us his montage which illustrated his high-risk situations, the support he might have in the community and the activities he might undertake.