My Beautiful Mind board looks like this:
We know from the premiere that we're building to Mabel crouching over a bloodied body - more likely stabbed than shot, and definitely not poisoned.
Stabbing has come into play by way of Jan, though that could have been self-inflicted.
So far we have poisoning, shooting, and stabbing. What kind of killer dabbles in all 3?? If Tim was shot as a cover for the fact that he was also (originally) poisoned, why shoot him vs stabbing him (or slitting his wrists, if the idea was to make it look like suicide)? A gunshot is so risky in terms of a