Probably not. Scans reveal that Tut's death was more likely tied to a leg injury:
The results of a CT scan done on King Tut’s mummy indicate the boy king was not murdered, but may have suffered a badly broken leg shortly before his death at age 19 — a wound that could have become infected, Egypt’s top archaeologist said Tuesday.
Zahi Hawass, secretary general of the Supreme Council of Antiquities, announced the results of the CT scan about two months after it was performed on Tut’s mummy.
Hawass said the remains of Tutankhamun, who ruled about 3,300 years ago, showed no signs that he had been murdered — dispelling a mystery that has long surrounded the pharaoh’s death.
“In answer to theories that Tutankhamun was murdered, the team found no evidence for a blow to the back of the head, and no other indication of foul play,” according to a statement released by Hawass’ office.
“They also found it extremely unlikely that he suffered an accident in which he crushed his chest.”
At least a violent death has been ruled out. Still, the case will remain forever open:
Hawass told The Associated Press that, despite ruling out the theory that Tut was killed violently, he had no idea how the king actually died.
“I have two theories — that he may have died from natural causes or that he was poisoned,” Hawass said. “We are going to look at his viscera to see if his organs show any signs, but it is virtually impossible to prove how he died.”
Hawass said some members of the Egyptian-led research team, which included two Italian experts and one from Switzerland, interpreted a fracture to Tut’s left thighbone as evidence that the king may have broken his leg badly just before he died.
“Although the break itself would not have been life-threatening, infection might have set in,” the statement said. “However, this part of the team believes it also possible, although less likely, that this fracture was caused by the embalmers.”
And to think of the time I spent watching those "Who Killed King Tut?" documentaries on the Discovery channel...