A man who confessed to killing four people and who tried to kill at least two others will remain behind bars.

The Eaton and Ingham County prosecutors say that’s after the Michigan Parole Board turned down a request from Don Miller.

They won’t consider another request for at least five years.

Miller was convicted of two counts of assault with intent to murder in Eaton County back in 1979. He is serving a sentence of 30 to 50 years. He was also convicted of being a prisoner in possession of a weapon in 1994.

Miller also confessed to killing four other people. He was charged with two counts of manslaughter and one count of 1st degree sexual assault. The sentences in each of those cases have already expired.

The manslaughter cases were in Ingham County. The assault and sexual assault cases were in Eaton County.

Corrections Department spokesman Chris Gautz says Miller’s parole was turned down partly because the board felt he could pose a risk to the public.

“Prosecutors, victims, police and community groups will remain steadfast in our efforts to keep mid-Michigan’s notorious serial killer in prison for as long as legally possible,” said Eaton County Prosecutor Doug Lloyd in a press release.

“The behavior of Don Miller is uniquely dangerous, violent and disturbing,” said Ingham County Prosecutor Gretchen Whitmer in the same release. “I am pleased the Parole Board recognized how dangerous and violent this offender is to our society.”

But Miller’s attorney Tom Bengtson believes the decision was “preordained,” and says he hopes Miller gets professional help to satisfy the board before his next opportunity.