Slain 12-year-old's twin tried to save his life

Gary police are seeking public's help in identifying assailant who fatally shot a 12-year-old Chicago boy in rthwestern Indiana city over weekend.

Demetrius Townsel Jr. was prounced de Saturday night at a Gary hospital, Lake County Coroner's Office said.

fatal shooting of youth, who lived in Chicago's Back of Yards neighborhood, has been ruled a homicide from a gunshot wound,

Chicago anti-violence activist Andrew Holmes and members of Townsel's family, including his twin bror, spoke at a news conference Wednesday in Gary.

victim's twin tried to save his life by putting pressure on gunshot wound en route to hospital.