Keith Jordan Lambing

A daring escape plan by a Butler County Prison inmate charged with homicide and rape in the death of his girlfriend’s son never got off the ground, authorities said.

Keith Jordan Lambing’s purported pie-in-the-sky plan last month was ill conceived and doomed to fail, said Butler County Detective Tim Fennell.

“It was unlikely to have succeeded in any case,” Fennell said today, “but it was more unlikely due to the heightened security in his particular case.”

Lambing, 20, is to be arraigned via video Wednesday afternoon at the prison on a felony charge of attempted escape.

He has been behind bars since March 22 — a day after Butler Township police say he sexually assaulted 4-year-old Bentley Thomas Miller, causing internal injuries so severe that the boy bled to death.

He is being held without bail and remains in administrative protective custody — isolated from the general population — at the facility.

Lambing’s alleged escape plan surfaced March 28 during a monitored call he made to a family member.

In the call, according to court documents, he told his grandmother, “I got a note I’m gonna show you when you come in and stuff, all right?”

His grandmother responds, “OK. All right. Yea.” Lambing then tells her, “I can’t really talk you know.”

Later that day, a correctional officer uncovered a note in Lambing’s private cell referring to how someone could help him “snip” his restraints while being transported from the prison to the courthouse for a hearing.