Timothy McVeigh found plenty of help constructing his deadly bomb in friend Terry Nichols. Nichols helped McVeigh secure most of the needed materials for the bomb and even drove him to Oklahoma City. Though he was back at his home in Herrington, Kansas during the bombing, officials were able to tie him to McVeigh as an accomplice.

Britannica reports that Nichols was officially charged on May 10, 1995, and formally indicted later that summer. In his 1997 trial, Nichols was found guilty of one count of conspiracy against the government and eight separate charges of involuntary manslaughter. He was given life without the possibility of parole.

State charges were also brought against Nichols by officials in Oklahoma. Found guilty on 161 first-degree murder charges, Nichols faced the death penalty but was able to escape it in his federal trial as the jury was unable to give unanimous consent for that punishment. And as Oklahoma law mandates that any death penalty verdict be unanimous, the state was forced to settle on 161 life sentences, served consecutively without any possibility of parole.

Nichols is currently incarcerated at the ADX Supermax federal prison in Florence, Colorado. He is serving his time alongside other notorious terrorists, including Unabomber Ted Kaczynski and Olympic Park Bomber Eric Rudolph (via CBS News).