 A Fayetteville man has pleaded not guilty after admitting to police he killed his roommate, according to court documents. 27-year-old Jason Lawson was arrested on June 13th on first-degree murder and tampering with physical evidence charges. Fayetteville police responded to welfare concern on June 12th at an apartment on Lapis Lane where they found a dead man on the kitchen floor. The FPD said they were tipped off on a killing that took place on June 8th. 33-year-old Benjamin Martin was found dead in the apartment with no one else inside, according to the report.