Ariel Castro - who locked up his victims at his home in Cleveland, Ohio - today struck a deal in court to avoid the death penalty.
The 53-year-old will be sentenced to life without parole plus 1,000 years, prosecutors said.
Entering a guilty plea this morning, Castro said: "I knew I was pretty much going to get the book thrown at me."
He added: "My addiction to pornography and my sexual problem has really taken a toll on my mind."
The former school bus driver, who was born in Puerto Rico, had been due to stand trial on 5 August.