during the murders, there were arrests of suspects, self-confessions of being the murderer, witnesses seeing suspicious persons;
after the murders, police officials published memos and memoirs naming suspects; later, researchers/authors proposed suspects.
[click name, scroll down for details]
L: "LEATHER APRON"
P: PIGGOTT, William Henry; PIZER, John;
U: UN-NAMED - arrests; suspicious persons; seen with victim
over the years, theories have been proposed as to the identity of Jack the Ripper and the reason for the murders:
[click theory for details]
DOCTOR THEORIES; ROYALS THEORIES; MASONS THEORIES; MAYBRICK and the "DIARIES" THEORY.