Who is responsible for Gatsby's death in "The Great Gatsby"?tom? Daisy? Gatsby himself? or Myrtle? Give reasons why or why not these characters are...

If you want to answer the question literally, it would be
George (Myrtle's husband), since he pulled the trigger of the gun that shot Gatsby to
death (and then shot himself).

However, let's back up a few
steps and follow the chain of events that led up to this
act.

Backing up one step, we find George talking with Tom
who told George that it was Gatsby's car that ran her over (even though Tom knew full
well that Daisy was driving it at the time of the accident). So you could rightfully say
that Tom was responsible.

But, back that up a step and we
see Daisy who was the hit and run driver who killed Myrtle who angered George who sought
revenge in killing Gatsby, and we see that Daisy was also indirectly
responsible.

Myrtle also has an indirect role in that if
she hadn't have run into the road to try and flag Tom down (since she had seen Tom
driving this same car earlier in the day and assumed he was still in it) she would not
have been hit...which triggered the events we mentioned
above.

Finally, we see that Gatsby himself has a part to
play. If he hadn't started the affair with Daisy and then told Tom in New York that
Daisy was leaving Tom to be with him, then Daisy would not have run off confused and
frantic in Gatsby's car and hit Myrtle which, again, started the whole tragic chain of
events.

So the direct answer to your question is: All of
the people you mentioned were in some way responsible for Gatsby's
death.