The following was one of the most detailed and exhaustive narratives on the topic.
Opinions expressed herein may not always agree with one, but FWIW, a good informative read, particularly about Ruby’s life.
http://www.history-matters.com/pds/dp3.htm
Deep Politics and the Death of JFK by Peter Dale Scott, 1993,
One of the women who worked for Jack Ruby stated she saw Jack and Oswald talking before the assassination. I don’t remember if it was days or weeks before.
Jack was known to have many contacts with mob figures.
I’ll take a gander at that link. Thanks.