A welfare check on September 9, 2025, brought McClain County deputies to a home near Coyle Drive and 300th Street in Blanchard, Oklahoma, where a disturbing scene awaited. Inside the residence were two deceased people later identified as 82-year-old Alan Zimmerman and 80-year-old Barbara Zimmerman. Deputies encountered an armed 56-year-old man, identified as David Zimmerman, and a standoff followed with officers attempting to negotiate.

When officers entered the house they found David Zimmerman dead from an apparent gunshot wound and the two older victims deceased. The Oklahoma State Bureau of Investigation has been called to lead the inquiry into the double homicide. Neighbors recalled Alan and Barbara as a long-time, well-liked couple who had lived in the home for nearly three decades. The motive remains under investigation.

If anyone knew Alan or Barbara Zimmerman, or has information about what happened near Coyle Drive and 300th Street on September 9, please share what you know with investigators.