Anthony McIntosh, the former Prince George’s County jail guard charged with neglecting a dying inmate accused of killing a police officer, pleaded not guilty Thursday in federal court in Maryland.

McIntosh, who appeared at his brief arraignment in Greenbelt, was arrested in January, three years after 19-year-old Ronnie White was discovered strangled in his cell.

White’s death was ruled a homicide by the medical examiner’s office, but a Maryland State Police investigation later found that White could have killed himself.

McIntosh, 48, is not accused of attacking White. He faces federal civil rights charges for allegedly ignoring White when he was “in apparent need of emergency medical care,” according to prosecutors. In a report and interview with a detective, the indictment says McIntosh led authorities to believe that another guard first told him that White was unresponsive in his cell.

Deborah Boardman, McIntosh’s lawyer, declined to comment on the case Wednesday. A trial is scheduled for January.