[MargaretR]

There are so many 'who done it' theories that it is difficult to choose which to believe.

Some theories appear so outlandish that their only purpose seems to add confusion.
eg - I recently read one where 'Jackie did it' - a small pistol in her handbag - that is the most incredible one I've seen.

As Cashy said - it is unlikely we will ever find out the truth, but the official version (Warren enquiry) has more holes in it than any rabbit warren.