A Jackson County man has pleaded not guilty after police said he threatened his roommate with a loaded handgun. 20 year old Sean Gregory of Maquoketa is charged in Iowa District Court of Jackson County with assault while displaying a dangerous weapon. According to reports, Gregory threatened his roommate, Tanner Sendt, with a loaded handgun on June 7th at their residence. Sendt told authorities he feared for his life. Gregory’s next court appearance is scheduled for August 5th.