DMAX, a joint venture of GM and Isuzu, was founded in Moraine in 1999 to supply diesel engines to heavy-duty trucks.
There, the Dryden Road operation has been reliably productive, weathering recessions and the closure of an SUV assembly plant nearby in late 2008.
DMAX in Moraine has usually had about 700 to 800 workers.
In 2021, GM opened its Brookville DMAX plant, an operation initially meant to complement the work in Moraine.
When it was first announced in 2019, the $175 million Brookville DMAX plant was conceived as operating concurrently with the original DMAX plant, sending the Moraine plant machined engine components for assembly.
But GM continued to make moves after the Brookville opening. It purchased 53 acres of land in Brookville near its new plant, off West Campus Boulevard.
In a mid-April meeting, a Dayton-Montgomery County Port Authority official acknowledged that an expansion of the Brookville DMAX plant would indeed siphon employment from the Moraine plant.
If a Brookville announcement does mean a loss of jobs in Moraine, it would be the latest blow to that community in several weeks.
A third employee was also wounded in that shooting, possibly by a stray bullet as the man fired more than 12 rounds, Moraine police said.
The woman, who was also at the DMAX plant at the time, was not injured. Jeffrey James Allen III, 28, of Dayton was pronounced dead at the scene.
The shooting suspect no longer required intensive care at a local hospital, but police had still not identified him as of June 6.
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