NYPD Det. Hassan Hamdy testified for three hours before a grand jury .
A grand jury will probe the shooting death of Noel Polanco, 22.
Hassan Hamdy, an ex-Marine in a dangerous NYPD unit, has also seen his share of controversy.
Tyjuan Hill, 22, allegedly pulled a handgun on cops at Huntington and Henry streets in Brooklyn.
Family and friends marked the one year anniversary of John Collado, who was killed by the NYPD.
The man shot Saturday had threatened cops in the past, reports say.
Darrius Kennedy, 51, was shot dead by police officers on Seventh Avenue at 37th Street.
Family criticizes cops for applauding officer charged with manslaughter in Ramarley Graham shooting.
A small group of protesters gathered in front of Bronx D.A. Robert Johnson's office Wednesday morning.
Friends mourned Annie Fryar, who was allegedly shot dead by her brother.
Protesters gathered in front of Bronx station house on what would have been Graham's 19th birthday.
Four cops were shot in a battle with a gunman at 3301 Nostrand Ave., near Avenue T on April 7, 2012.
Ramarley Graham's family held a vigil and march Thursday for the 18-year-old, who was killed by cops.
John Collado's family will call for a federal investigation into the police shooting death.
The fatal shooting of Ramarley Graham is going before a Bronx grand jury.
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