Raymond Armstrong, a man who once made a living as a model for clients such as Kenneth Cole, iPod and Target, was in a Philadelphia courtroom Wednesday for the start of his murder trial.Armstrong, 35, is charged with the Sept. 27, 2008 strangulation death of Anthony Williams, 37, a longtime friend who often let Armstrong stay at his Grays Ferry home. The slaying allegedly took place inside that Wilder Street home shortly before 10:30 p.m. during a struggle so violent that neighbors heard the commotion from the street.