Jodorowsky's Dune Uncovered
Scene 70 : Suspected Traitor
Outside of the palace Gurney shows Leto, Paul and Hawatt a military lorry full of the heads of dead Harkonnens.
Gurney hands the Duke a letter found on a body. The letter bears the authentic seal of the Baron.
Leto takes the letter and reads it; "...Lady Jessica has accepted to assassinate the Duke..."!
Paul objects, but Leto acknowledges that it is formal proof, and order Jessica to be watched.
When Gurney and Hawatt have left Leto confides to Paul that he knows it is a lie, but he hopes to cause the true traitor to now act rashly. He then asks Paul that if anything happens to Leto that Paul must tell Jessica that he never stopped trusting her.
We can see the progression of the character design for Hawatt in the illustrations. Originally he was to have a peg-leg.