A Blanchard man shot and killed his parents on Tuesday and was later found dead inside their home after an officer-involved shooting. State agents said 56-year-old David Zimmerman died from a gunshot injury.

The Oklahoma State Bureau is investigating the officer-involved shooting. Agents are working to determine if Zimmerman died during a shootout with police or if it was self-inflicted.

Residents in a Blanchard neighborhood near 300th Street and Meridian Avenue witnessed a tragedy unfold.

"I just felt something was wrong so I called the McClain County Sheriff's department," said the neighbor.

The man heard gunshots coming around 11 a.m. from Alan and Barabara Zimmerman's home. The neighbor said the married couple's son had mental health issues.

"I don't mean nothing bad about mental

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