When asked if he understood he would never be released from prison, Ariel Castro said: "I do understand that, your honor."
He added, "I knew I was pretty much going to get the book thrown at me."
The deal comes more than a month after a statement issued on behalf of the women said they were "hopeful for a just and prompt resolution" and had "great faith in the prosecutor's office and the court."
More top news
The South African Salvation Army has used a picture of a dress that sent the web into meltdown to raise awareness about domestic violence.
With heavy rain continuing across much of western Scotland the Met Office has issued an "amber" warning from 6pm today until 6am on Sunday.
As Liberia celebrates its 'last Ebola patient' Sierra Leone sees its hopes of being free of the disease dashed.