Robert Greig Placette was gunned down while trying to protect children during a robbery at the restaurant off of the Katy Freeway in late August.
Mario and Corey Hilton, Leroy Houston and Kenya Jackson have all been charged with capital murder in connection with the ambush. The suspects also shot a restaurant employee, police said.
The 57 Denny's restaurants throughout the Houston area will be donating 25 percent of each check Monday between 4 and 10pm to the Robert Greig Placette Memorial Fund.
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