The Santa Clara County District Attorney has charged 49ers All-Pro linebacker Aldon Smith with three felony weapons assault charges, prosecutors announced on Wednesday. The charges stem fom a June 2012 house party hosted by the 24-year-old Smith where he was stabbed and two others were shot, and deputies later found a cache of assault rifles, magazines and ammunition. NBC Bay Area's Investigative Unit was the first to report the charges.Smith is currently on "indefinite leave" from the 49ers after San Jose police arrested him at 7 a.m. on Sept. 20 on suspicion of driving under the influence and possession of marijuana in a separate matter. He is expected to appear in court on Nov. 4 to answer those misdemeanor DUI charges, which allege is blood alcohol content was at least .15 - twice the legal limit.Prosecutors on Wednesday said Smith is expected to "self-surrender" later this month on charges that he had illegal weapons, which, according to documents, were bought in Arizona in 2011 -- days before the 49ers played the Arizona Cardinals in December of that year. In most cases, certain types of assault weapons cannot be legally bought in Arizona by California residents or...