Only the coroner’s office can make a ruling on cause and manner of death.
Mannix was not in the office Wednesday, according to employees there, and could not be reached for an explanation of the ruling.
Middletown Police Chief Rodney Muterspaw said Wednesday the case is being investigated as a homicide.
Major Scott Reeve said police are continuing to receive tips. Anyone with information is asked to call Detective Brandon Highley at 513-425-7724.
MORE: Help Middletown police identify suspects, vehicles from fatal shooting
Dispatchers were told that a gold KIA with a small spare tire on the vehicle and black primer bumpers on the front and back fled the area just after the shooting.
Detectives are also looking for a Volkswagen Passat that is brownish gray in color occupied by three black males that witnesses said were pointing guns at Fuller in Douglass Park.
According to Middletown Municipal Court records, Fuller had been charged 30 times dating back to 2013 on various drug, traffic and assault charges.