Wild Bill was a genuine celebrity and historical figure in his own time. In the Civil War he was a union spy and was credited for a lot of kills and heroic deeds. It's hard to separate legend from fact because of all the press and popular writing that touted his deeds. After the war he served as a scout for Custer, and Custer wrote about him:
General Custer Recalls Wild Bill Hickok
Whether on foot or on horseback he [Hickok] was one of the most
perfect types of physical manhood I ever saw. Of his courage there could be no
question: it has been brought to the test on too many occasions to doubt. His
skill in the use of the rifle and pistol was unerring; while his deportment was
exactly the opposite of what we expected for a man of his surroundings. It was
entirely free of bluster and bravado. He seldom spoke of himself unless
requested to do so. His conversation, strange to say, never bordered either on
the vulgar or blasphemous. His influence among the frontiersmen was unbounded,
his word was law, and many are the personal quarrels and disturbances which he
has checked among his comrades by the simple announcement that "This has gone
far enough," if need be followed by the ominous warning that when persisted in
or renewed the quarreler "must settle it with me."
Wild Bill is anything
but a quarrelsome man; yet no one but himself can enumerate the many conflicts
in which he has been engaged, and which have almost invariably resulted in the
death of his adversary. I have personal knowledge of at least half a dozen men
whom he has at various times killed, one of these being a member of my command.
[One of a group of cavalrymen who tried to gang up on Hickok in Hays City in the
summer of 1870.]
Others have been severely wounded, yet he always
escaped unhurt. On the plains every man openly carried his belt with its
invariable appendages, knife and revolver, often two of the latter. Wild Bill
always carried two handsome ivoryhandled revolvers of the large size; he was
never seen without them. [Probably the handguns given to Hickok by Senator
Wilson.]
Custer's wife also wrote:
Wild Bill as Mrs. Custer Remembered Him
Physically he was a delight to look upon. Tall, lithe and free in
every motion, he made and walked as if every muscle was perfection, and the
careless swing of his body as he moved seemed perfectly in keeping with the man,
the country, the time in which he lived. I do not recall anything finer in the
way of physical perfection than Wild Bill when he swung himself lightly from his
saddle, and with graceful, swaying steps, squarely set shoulders and well
pointed head, approached our tent for orders. He was rather fantastically clad
but that seemed perfectly in keeping with the time and place. He did not make an
armoury of his waist, but carried two pistols. He wore top-boots, riding
breeches, and dark blue flannel shirt, with scarlet set in front. A loose neck
handkerchief left his fine firm throat free. I do not at all remember his
features but the frankly, manly expression of his fearless eyes and his
courteous manner gave one a feeling of confidence in his word and in his
undaunted courage."
Because of the fame built around him, he often was targeted by gunmen wanting a reputation, but the few who actually attempted an assault where shot or pistol whipped. Most never got up the courage.
Like several other of the toughest gunmen, he was assassinated from behind, most likely prompted by underworld figures in Deadwood who feared he was going to put on the badge. To me he is one of the most interesting men of the wild west period, short as it was.