It was his best option. Several threads already created.
How did Sheila commit the massacre ? You seem to be keen to try to find faults on Jeremy committing it. All easily answered.
If you mean by answering, Several threads already created, I can see it is an easy answer for you, but makes little sense to me!

It can´t be anybody´s "best option" to shoot someone twice, then stage it as a suicide, that is nonsense.