March 2, 2012 5:48 pm Knife-Wielding Suspect Had Prior Arrests Lt. J.D. Arvan speaks with NBCSanDiego about the incident involving 22-year-old suspect Andrew Luna and an officer. US & World Videos 2:07 New study links consuming red meat with dementia 2:05 Police find, return dozens of abandoned Amazon packages 0:28 A Vermont state trooper plunges into icy pond to rescue 8-year-old girl 2:59 Keep these travel etiquette tips in mind this holiday season