One evening in May of 1978, Robert Pretty came home from work to a nearly silent house. Breakfast was still on the table, and all that could be heard was water dripping. As he looked for his family, he followed the drip. In the bathroom, Robert found his sons Mark and Scott deceased in the bathtub. In the master bedroom, he found his wife Karen also dead in the tub. Though the police tried to find evidence, they discovered almost nothing that pointed them in the direction of a strong lead. A motive was just as elusive, if not more so.  The case went cold fast. The following year, another family was murdered in their Houston home, prompting police to look for similarities.

If you have any information about the murders of Karen, Scott, and Mark Pretty, please contact the Homicide Unit at the Houston Police Department at 713-308-3600.

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Sources: The Houston Chronicle, The Houston Post, and The Austin American Statesman 

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