Profondo Rosso (also known as Deep Red or The Hatchet Murders) is a 1975 giallo thriller film directed by Dario Argento and starring David Hemmings. Plot Profondo Rosso follows music teacher Marcus Daly (Hemmings) as he investigates the violent murder of psychic medium Helga Ulmann (Macha Meril), which he witnesses in an apartment building. Other key characters are introduced early, including Daly?s occasional friend Carlo (Gabriele Lavia), Ulmann?s associate Dr. Giordani (Glauco Maur