The suspect died after the shootout with three officers in a parking lot next to a Brooklyn school, police said.
In the hours between the two confrontations, the suspect menaced the other man by text, calling himself the "Grim Reaper," police said.
The deadly episode unfolded at about 2 a.M. When the suspect drove up and confronted his ex and the other man as they stood outside the Resorts World Casino, police said. Police said the victims were casino employees and the suspect was a former worker there.
After the suspect fled, he texted the man several times, "taunting him and calling himself the 'Grim Reaper,'" said Robert Boyce, the New York Police Department's chief of detectives. He also messaged the woman's family, saying, "I'm not going down easy," Boyce said.
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About four hours later, three plainclothes officers found him in the parking lot.
"As they pulled up, they were immediately fired upon by this individual," Boyce said. All three officers returned fire. The suspect was pronounced dead at a hospital.
Police said the suspect had an arrest record that included armed robbery.
Mohammed's aunt, Rose Marie Guilford, said the suspect and her niece were in an abusive relationship before breaking up about a year ago and that the other man was only a friend.
Guilford said the suspect twice called her. "He told me I should prepare myself to bury my niece," she said. "I couldn't say anything. What am I going to say? I was just listening to the guy rant and rave.