Desperate Measures

In May 2010, wealthy married couple, Dennis and Merna Koula, were found shot dead in their Wisconsin home. There was little evidence from the crime scene, but one clue - computer keystroke - became critical. And one person who knew the couple very well would become the prime suspect. "48 Hours" correspondent Peter Van Sant reports. This classic "48 Hours" episode last aired on 8/3/2013.

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