My opinion it is a female carpenter bee (males have a white square on their face and don't sting either). I agree with Bluebee that if the honeybees removed the hair, why only on the abdomen? Bombus impatiens is the most common bumblebee around here and they have a wide range of sizes. The male is about 2x the size of a honeybee drone and the female is 8-10x the size of a honey bee. It is quite common to find dead bumblebees in your hive. The new queens are reared in the fall and after mating look for a place to hibernate. Commonly in dry leaves, but just like you find them flying around looking for a nesting place in the spring to start a colony, you will find them hunting out a hibernation spot in the fall. Sometimes this will lead them into a beehive and either they get chased off or killed.