Why was Turnbull killed?

Hint 1 of 6:

Travis was the Egyptian correspondant for The Times.

Hint 2 of 6:

So I'm sure that he wrote all of the articles about egyptology.

Hint 3 of 6:

He was also a nut (both a big fan and an insane person) about Egyptian
history, as you saw when you went to talk to him.

Hint 4 of 6:

Look in The Times to see if he wrote anything controversial about
egyptologists.

Hint 5 of 6:

There's an article at the top of page 2 of the August 17, 1888 issue.