NEW : Two killed are Detective Eric Williams and murder suspect Jeremy Powell , police say . He was interviewing a murder suspect inside police headquarters . Detectives overheard gunshots , went into the room and found the suspect and Powell dead . Mississippi Bureau of Investigation is leading the investigation into what happened .
NEW : Two killed are Detective Eric Smith and murder suspect Jeremy Powell , police say . He was interviewing a murder suspect inside police headquarters . Detectives overheard gunshots , went into the room and found the suspect and detective dead . Mississippi Bureau of Investigation is leading the probe into what happened .