Usually, show downs in 'Vegas end with a winnning hand. But in 1880,
one ended with a dead lawman. Name him.

This looks like another tough one. Let me run a couple of options past
ya, podner...

"In the spring of 1880, [John Joshua] Webb was arrested and sentenced
to hang for the killing of local cattleman Michael Kelliher and on
April 30, 1880, Dave [Rudabaugh] and gang member Little Jack Allen
attempted to break him out of the Las Vegas jail. Deputy Sheriff (and
jailer) Antonio Lino Valdez was shot and killed by Dave in the process
of the escape attempt, but Webb was not rescued."

http://www.angelfire.com/mi2/billythekid/dave.html

"William B. Weaver, 36, an Elko County deputy sheriff killed in 1880
in a six-shooter battle after a fight over a poker game at the Delta
Saloon in the mining town of Tuscarora."

http://www.reviewjournal.com/lvrj_home/2003/May-05-Mon-2003/news/21242116.html

Although Weaver was not killed in Las Vegas, he was killed during a
poker game. "Vegas" and "showdown" in the question could be a
reference to poker, and this Vegas showdown ended with a dead lawman.

What do you think?

Dose it say what game william was playing when he was killed. Such as
poker texas hod'em or something like that.

There apparently was a killing of a marshal in Las Vegas, New Mexico,
in January 1980:

"Miquel Otero, later governor of New Mexico wrote that in one month
twenty?nine men were killed in the Las Vegas vicinity. It seemed as if
every low?life from Kansas, Texas, and Colorado had congregated in Las
Vegas. As the Ford County Globe of September 30, 1879 had alluded,
some mysterious business was being transacted in Las Vegas. On January
22, 1880, Marshal Joe Carson was killed in a shootout in the Close &
Patterson Variety Hall. Carson shot the four assailants, one mortally.
Another was seriously wounded and arrested."
West Legends: John Joshua Webb (about two-thirds down the page)
http://www.angelfire.com/apes/westlegends/Webb.htm


Here's a reference to the same incident from a French website:

Le 22 janvier 1880, le Marshal Joe Carson, 40 ans, se frotta à quatre
cow-boys ivres à l'intérieur du Close and Patterson's Variety Hall. 
Il y avait plusieurs clients dans l'établissement lorsque la fusillade
éclata.
Far West Magazine (about halfway down the page)
http://www.chez.com/farwestmagazine/product2_16.htm

markj-ga