Prosecutors say an off-duty Jersey City officer saw 24-year-old Samir Nicholson shoot another man in East Orange on Saturday.
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It happened on South Clinton Street around 1 p.m.
The officer then shot Nicholson, who died a short time later.
Authorities say the man who Nicholson shot survived.
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The sister of the man who survived says her brother had just come back from Wells Fargo, and that the officer is a hero.
"I want to say thank you to the officer, because if it wasn't for him, my brother would be dead right now, so if you're watching this, I just want to say thank you!" the woman said.
The officer was not hurt and is still on active duty, pending a review.