The lawyer for the last inmate of a group known as the "Angola Three" says his client is going to be released from custody after pleading no contest to manslaughter and a lesser offense in the 1972 death of a prison guard.

George Kendall, a lawyer for Albert Woodfox, told The Associated Press that Woodfox was expected to be released Friday.

Woodfox and two other men became known as the "Angola Three" for their decades-long stays in isolation at the Louisiana Penitentiary at Angola and other state prisons. Prison officials said they were kept in solitary because their Black Panther Party activism would otherwise rile up inmates.

Woodfox consistently maintained his innocence in the killing of guard Brent Miller. He was awaiting a third trial in the case.