After 25 years, has the Alachua County Sheriff's Office solved one of Florida's biggest mysteries - what happened to Tiffany Sessions? Tracy Smith and 48 HOURS investigate the disappearance of the college student and the search for Sessions.

Is Olympic star Oscar Pistorius a cold-blooded killer, or was the shooting death of his model girlfriend Reeva Steenkamp in the middle of the night an accident? With the sprinter's fate resting in the hands of a South African court, 48 HOURS examines the emotional drama at the heart of the case.