There is a Texas Historical Marker marking the spot of the gunfight here.

Four Dead in Five Seconds Gunfight

The Four Dead in Five Seconds Gunfight was a famous gun fight that occurred on April 14, 1881 on El Paso Street, El Paso, Texas. Witnesses generally agreed that the incident lasted no more than five seconds after the first gunshot, though a few would insist it was at least ten seconds. Marshal Dallas Stoudenmire accounted for three of the four fatalities with his twin .44 caliber Colt revolvers.

• http://en.wikipedia.org/wiki/Four Dead in Five Seconds Gunfight