Maybe I'm a bit naive, but I can't imagine a female using a saw to dismember a body (or anyone for that matter!), seems more like a male thing to do (hope that's not being sexist!).
Would a female have the strength to do it? Physically?
As I am one who follows cases of dismemberment for years (as it takes special evil to do that), I can tell you that quite a big part of those are actually done by women. I was quite surprised as you when I came to that realization for the first time.
In almost all the female cases it is done due to logistical reasons - dead body being dead heavy. Women having problems to even lift it, hence opting for this brutal option.
Another reason - disposal without being seen - reason why lots of dismemberment cases happens in big cities - New York City is flooded with those cases, Chicago, London.
In New York few years back land lady dismembered her female tenant - they quarrelled about rent. Body parts of her were discovered in different parts of Long Island, even on park lawn.
Other reason - mostly criminals, gangs and husbands do it to prevent identification
Recently another bizarre case, woman who was herself missing person for decades dismembered hairdresser in Florida. Murderer Kimberly Kessler used over 16 different aliases over the years and moved from state to state. Who knows how many other victims of her are out there. Her victim, Joleen, has not been found yet.
I also have to mention serial killer Ed Kemper, though he is not female. His dismemberment of his mum had absolutely nothing to do with any of the above mentioned reasons, his reason was pure hatred towards her.
What I have to mention are Techniques of dismemberment
- most usual are cases of missing hands and feet
- than whole arms and whole legs plus decapitation - leaving only torso
- last and rare are cases when someone does try to dismember through torso (so this case is definitelly in rare category. Only one other such a case which springs to mind was dismemberment of young Swedish nanny, Karina Holmer, on East Coast of America. She was chopped in half through torso, her bottom half of body never found. Case is still unsolved.
It takes special kind of evil not just to murder but to do this to another human being afterwords. Calculated and planned, those killers would do anything just to avoid being caught.