It happened outside a furniture plant in Monticello.
A woman and her boyfriend were sitting in a vehicle in a parking lot.
That's why police say her estranged husband showed up and opened fire, and then killed himself.
The boyfriend died at the scene and the woman died later at the hospital.
Detectives recovered a handgun.
It's not known at this time if the victims worked at the furniture plant.
The gunman didn't confront anyone in the building.
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