Los Angeles Police Chief Charlie Beck says investigators were flooded with information following the release of about 180 pictures found in suspect Lonnie Franklin Jr.'s home.
Beck said they've been able to identify more than 50 of the women so far.
"Of those 50 individuals, we've opened four missing-persons cases and so we're looking at those individuals very closely to see if they may, and I emphasize may, be additional victims," said Beck.
Franklin is charged with 10 murders in the case. He has pleaded not guilty.