Student arrested in Mississippi murder of Ally Kostial; Dad kills daughter's boyfriend over drugs; more

Summary: Mississippi college student found dead miles away from home before anyone knows she's missing; fellow student arrested. Pennsylvania dad guns down the guy supposedly feeding his teen daughter drugs - but cops say he got it wrong. Investigators unravel mystery, discover more after Louisiana woman brings dead daughter into E.R. Iowa man storms off into blizzard one night in 2009 and vanishes. They finally found him - in the last place they looked.