Maritime Missy and patterned killers
Missy, you must get away from this kind of thinking where everything happens in a patterned, evolving and logical sense. This is not the way people work; it’s the way movies work.
So, as to someone who bludgeons, not following a path of strangulation. Take the case of the Yorkshire Ripper, Peter Sutcliffe. Sutcliffe was active from 1975 to 1981. He mainly used a hammer, but on a few occasions he strangled his victims. The same non-patterned behavior is true of Clifford Olsen.
Also, don’t look for violence escalation; sometimes it’s true, sometimes it isn’t.
Life doesn’t fit a neat pattern.