When a Phoenix, Arizona couple is murdered in their own home, responding officers consider it one of the cruelest crimes they've ever investigated. Investigators search for the killer or killers of two beloved grandparents who'd devoted their lives to helping others in this episode of Last Seen Alive.

If you know anything about the deaths of Barbara and William Singer, please contact the Phoenix Police directly at 602-262-6151, or—if you wish to remain anonymous—call the Silent Witness tipline at 480-948-6377. If your tip leads to the identification of the Singers' killer or killers, you may be eligible for a cash reward of up to $5,000.

See photos from this episode and check out the sources we used to research it here:

https://lastseenalivepodcast.com/2025/05/05/unsolved-double-homicide-barbara-and-wiliam-singer/

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