By DOMINGO RAMIREZ JR. A 22-year-old woman whose body was found in a Lincoln Town Car on Northeast Loop 820 in North Richland Hills on Thursday night died from multiple gunshot wounds, the Tarrant County medical examiner's office ruled Sunday. Martha Martinez's death was ruled a homicide by the medical examiner's office.Witnesses said Martinez's body was thrown into the car, which was parked near a Fort Worth auto salvage yard, by a man identified by police as Eric Frias, 24, of Fort Worth.