Justin Sullivan, the man convicted of attempted terrorism in support of ISIS, has pleaded guilty to murdering his neighbor as a practice run for a planned mass attack and to steal money to fund the purchase of high-powered guns.

A baby-faced Sullivan appeared in court Monday morning and plead guilty to first-degree murder of his neighbor, 74-year-old John Bailey Clark. He was sentenced to life without parole for the murder.

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The FBI says Sullivan shot and robbed Clark to get money to help him buy an assault rifle he planned to use to commit the mass murder. He used a rifle he stole from his dad’s gun cabinet, which he hid in the crawl space.

WBTV is reporting, Sullivan’s case is the first murder in the name of ISIS on American soil.