Gail Sandidge rushed to help when screams rang out during a stabbing at a Texas medical center on Tuesday . A nurse was killed trying to protect patients , hospital system CEO says . One survivor remains in critical condition . Score: 7 The attack happened at Good Shepherd Ambulatory Surgical Center in Longview , Texas .
A nurse was killed trying to protect patients , hospital system CEO says . One survivor remains in critical condition . Score: 7 The attack happened at Good Shepherd Ambulatory Surgical Center in Longview , Texas .