Sorry if I missed it in Wool's account here but which ones? And what were the dates? Did they continue up to 1891 when the census indicates that he was back with his wife?
It wasn't in Karl's post, it's public info in the many books and casefiles.
"Fairy Fay", Whitechapel, December 1887 (no records, just rumour)
Annie Millwood, Whitechapel, February 1888 (attack, death came later, in March)
Ada Wilson, Whitechapel, March 1888
Headless torso, Pimlico, October 1888
Annie Farmer, Whitechapel, November 1888 (attack, not murder)
Rose Mylett, Poplar, December 1888
Elizabeth Jackson, River Thames, June 1889
Alice McKenzie, Whitechapel, July 1889
"The Pinchin Street Torso", Whitechapel, September 1889
Frances Coles, Whitechapel, February 1891
All unsolved, though worth pointing out that there was another serial killer at large in London at the same time, the so-called "Torso Killer", who could be responsible for some of the above.
And no-one's saying he split from his wife? That's a theory, nothing more.