Preview: "48 Hours" double feature
Hadiya Pendleton's parents speak out
David Muhammad takes a stand against gangs
Street gangs are "selling death and misery in the form of heroin"
Anti-violence group aims to heal community
Extra: Meeting Jodi Arias
Will County Coroner: "Heroin is everywhere"
Sneak peek: The War in Chicago
Heroin diaries: Recovering addicts on losing control
Heroin diaries: Jaymes Lindbloom's journey from addiction to recovery
Heroin diaries: "It's a living hell" says recovering addict
Heroin diaries: Paula Nixon's journey