"It's possible that somebody involved with the queen's staff may know something, may have seen something," Larcombe said. "It seems quite extraordinary that it wasn't until a dog-walker discovered this body that something was found."
The location of the body discovery, Anmer, is home to several dozen people, and is completely accessible to the public at all times. It is also said to be a favorite spot of Prince Philip's.
"The area where the body was found is next to a small village on the estate, which is one of Prince Philip's favorite hunting grounds, where he likes to go out this time of year," Larcombe said.
While the murder investigation might be the first to happen directly on the grounds of a royal palace, the storyline is eerily similar for the queen and her family.
The body of Robert James Moore, a U.S. man described as a loner and obsessed with the queen, was discovered in March on an island in St. James's Park near Buckingham Palace, roughly three years after Moore was believed to have died.