Beowulf wrote:
Of the 81 (some reports state 83) pioneers who began the Donner Party's horrific winter in the Sierra Nevada, only 45 managed to walk out alive. The ordeal proved particularly costly for the group's 15 solo travelers, all but two of whom died, but it also took a tragic toll on the families.
Much more info available online.
Wikipedia has the whole story in detail. Tragic.