piece of evidence was found on tony's email account. in november of 2010, just months before the murder, tony had emailed a friend in texas asking for help getting an ammo magazine for a .380 caliber handgun. >> state your name for the record and spell your last name. >> reporter: though the friend never sent the magazine, the prosecutor says the email was significant. >> mr. tung just happened to have an interest in the precise caliber weapon that was the killing weapon in our murder. don't you find that remarkable? >> reporter: though the murder weapon was never recovered, the prosecutor says this video seems to show tony exiting his car that night with something in his right hand. >> something was taken from that