Why was Weatherby killed?

Hint 1 of 4:

Remember that Travis was a freak about egyptology.

Hint 2 of 4:

I'm sure he applied to be on every expedition to Egypt.

Hint 3 of 4:

London University sent an expedition to Egypt, and Travis didn't get to go.

Hint 4 of 4:

In fact, Weatherby was picked ahead of Travis.