DeFarra Gaymon spent a year planning his Montclair High School 30th reunion, making sure to block out the date well in advance of his busy schedule as president and CEO of a credit union in Atlanta. Gaymon, 48, drove up to New Jersey Thursday for the gathering, which was to take place the following evening at the Crowne Plaza Hotel at the Meadowlands. He would never make it. Gaymon — whom everyone called “Dean” — was shot and killed Friday evening by an undercover detective from the Essex County Sheriff’s Office during a confrontation in Newark’s Branch Brook Park. The detective, who went to the park at 6 p.m. after receiving complaints about people engaging in sexual activity in public, fired a single shot into Gaymon’s chest, authorities said.

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