Quote:He killed Bor during the JMS run, and the Sentry during Siege (Seige). Still have no idea how Thor can kill a guy like that and succeed, but whatever, it's canon. Other than that, has he ever killed? My guess would be yes, but I can't think of any examples.
He has shown a tendency to kill frost giants, demons, and other monsters without much hesitancy though it isn't always clearly shown. He has clearly killed a number of frost giants, the Midgard Serpent, Durok the Demolisher, an Earth mutant, and even Loki on one occasion.
As for Sentry it was the point of the comic and Bendis later confirmed Thor was only able to kill Sentry because Robert wanted to die and let Thor kill him.
Staying dead, however does.