After three similar murders, Austin, Texas, police began to wonder if a serial killer was on the loose — did a man out for a late-night walk testing his new thermal imaging night scope capture images of the actual killer? “48 Hours” Maureen Maher previews an all new “48 Hours” airing Saturday at 10/9c on CBS.

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“48 Hours” investigates the most intriguing crime and justice cases that touch on all areas of the human experience including greed and passion. For 27 seasons, “48 Hours” has developed a rich history of original reporting and impact journalism that has helped exonerate wrongly convicted people, caused cold cases to be reopened and solved, and along the way changed lives. Check local listings for “48 Hours” broadcast times.

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