The North Carolina man who fired a rifle inside a Washington, D.C., pizzeria as he chased down an internet rumor related to Hillary Clinton was sentenced Thursday to four years behind bars.

Edgar Maddison Welch, 28, had pleaded guilty in March to two charges stemming from the Dec. 4 incident at the Comet Ping Pong restaurant. Prosecutors say he was self-investigating an online conspiracy theory — dubbed "Pizzagate" — that claimed the pizzeria was harboring a child sex-trafficking ring with connections to influential Democrats. Washington police and the FBI denied the theories had any substance.