Elizabeth Diane Downs shot her three children on a dark, remote road near Springfield, Oregon, in May 1983. Around this time, she had an affair with a very cute and very married man named Lew Lewiston who not only refused to leave his wife despite the affair but had zero interest in having children. 

Are the murder and affair related? We’ll see.

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Credits

Diane Downs: Her Children Got in the Way of Her Love

A New '20/20' Special Features the Daughter of "Mommy Murderess" Diane Downs

Diane Downs, The Killer Mom Who Shot Her Kids So She Could Be With Her Lover

Diane Downs Wikipedia