Greenwood was ambushed after parking his car at work in Baytown.
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A week later, authorities say they found his killer. The suspect, turned the gun on himself a day after killing Greenwood.
Greenwood leaves behind a wife and children.
The Crawfish Boil will raise money for his family and the 100 Club, an organization that supports law enforcement.
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Tickets are $5. One ticket covers one pound of crawfish.
The Crawfish Boil is taking place from 11 a.m. to 6 p.m. at the Royal Purple Raceway in Baytown. It's at 2525 FM 565 in Baytown.
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