On July 7, 2002, Mike Sisco and his fiancée, Karen Harkness, were found shot to death in her home in Topeka, Kansas. Police suspected Sisco’s ex-wife, Dana Chandler, but did not charge her until 2011 . She has since stood trial three times for the murders. Now, HBO’s A Killer Story examines why her convictions remain so contentious.

Sisco’s family told police that Chandler had harassed him and Harkness since the divorce. But Chandler lived in Denver and claimed she was in Colorado the weekend of the murders. The investigation went cold, and Chandler was not charged until a new district attorney took the case forward in 2011 . After three trials, Chandler was found guilty and sentenced to life in prison on June 3, 2025.

But not everyone was so sure of her guilt. True crime enthusiasts Eileen Umbehr and her husband Keen, a lawyer, had followed the case for years . They didn’t know Chandler, but after her conviction, they began going through the evidence, convinced that she was innocent.…