A rookie federal prosecutor who brought a case accusing former FBI Director James Comey of threatening President Donald Trump’s life by posting a photo of seashells on Instagram has stepped off the case. Matthew Petracca, who had been recently hired as an assistant U.S. attorney in the Eastern District of North Carolina, is no longer on the Comey case, according to a court filing . Petracca also dropped off of other criminal cases in the Eastern District of North Carolina in recent days, according to court filings. Petracca is a former Republican county committeeman in New Jersey whom U.S. Attorney for the Eastern District of North Carolina W. Ellis Boyle hired months ago, NBC News has reported . Boyle oversaw the highly criticized case, which will go to trial in October if it manages to survive legal challenges . Petracca had contemplated leaving the Justice Department altogether, according to two people familiar with the matter, but instead remained a DOJ employee after taking a week off.…