Dr Hawker

In the short story The Adventure of the Italian Nobleman, Dr Hawker was a friend of Poirot and Hastings. While dining with them, Hawker received a message from Miss Rider his housekeeper. One of his patients, Count Foscatini had called to ask for help saying, "They've killed me." Hawker rushed to the Count's residence with Poirot and Hastings but the Count was already dead.

Portrayals
Dr Hawker is played by Arthur Cox in the film adaptation of the original story in Series 5 of ITV's Agatha Christie's Poirot.

Arthur Cox makes a second, non-canonical appearance as Dr Hawker in a later episode, film adaptation of The Jewel Robbery at the Grand Metropolitan. Here Dr Hawker treated Poirot at the beginning of the episode and recommended that he take two weeks rest, preferably outside of London. In the the original story, Hawker did not appear. There, Hastings had made some money from a successful investment and suggested that Poirot take a holiday at a seaside resort with him.