(Salem, OR)  --  Salem Police are looking for witnesses who may have cellphone video of a robbery and stabbing at the West Salem Goodwill store on August 14th.  Police say the store's loss prevention officer, 33-year-old Matthew Thompson, suffered life-threatening injuries in a fight when he confronted 49-year-old Sean Graham for stealing items from the store.  Bystanders helped responding police detain the suspect.  Thompson remains hospitalized.