Paul Walker’s final appearance in the street-racing franchise “Fast & Furious” left a preview audience teary-eyed at the South by Southwest (SXSW) festival for the first public screening of the last film the actor made before he died in a car crash. In the film, Vin Diesel’s character says “those who are lost go on in the hearts of the living” and that was how it felt for many fans attending the midnight screening on Sunday. “Furious 7”, out in theaters on April 7, is Walker’s last appearance as law-enforcement officer Brian O’Connor.