Two different murders, two different areas, two different MOs, and two different victim profiles. Connected by one killer. 45 years later, police have his DNA, but not his name.

Sources:
https://www.thesteepletimes.com/the-wire/how-to-solve-an-unsolved-murder/

https://www.dailymail.co.uk/news/article-3010915/Police-hunting-bunny-girl-killer-make-fresh-appeal-40-years-brutal-murders-Playboy-club-model-teenage-schoolgirl.html

https://www.express.co.uk/news/world/566694/40-years-after-committing-a-double-murder-is-time-up-for-the-Bunny-Girl-Killer

https://www.thesun.co.uk/archives/news/167444/is-tragic-lynda-third-victim-of-the-bunny-girl-killer/

https://www.architectural-review.com/today/how-the-london-playboy-club-bankrolled-hefs-empire/8680952.article

https://en.wikipedia.org/wiki/Peter_Sutcliffe

https://www.mylondon.news/news/local-news/detectives-investigating-weedon-murder-test-6019928

https://www.theguardian.com/uk-news/2015/apr/24/police-50-calls-appeal-information-1975-murders

https://www.express.co.uk/news/uk/585998/Yorkshire-Ripper-killed-extra-23-victims-new-book

https://www.youtube.com/watch?v=9VhCecVmgNE