"Once again our hearts are broken in the NYPD", Commissioner James P. O'Neill said.
"Make no mistake about it, friendly fire aside, it's because of the actions of the suspect that Det".
De Blasio said Wednesday all flags in the city would be lowered to half-staff to honor the slain officer.
Police swarmed to the store around 6:10 p.m. after a 911 caller standing outside reported seeing the suspect take two employees to a back room at gunpoint, according to dramatic dispatch audio.
In 2009, Simonsen investigated the death of an 11-month old boy who drowned in a bucket of water at an unlicensed daycare while the woman running it was passed out on NyQuil.
The mayor said that he and the commissioner had told Simonsen's family that "the New York City Police Department will be there for them, the people of New York City will be there for them". He says they didn't hesitate, immediately responding.
A second officer, Sgt. Matthew Gorman, was struck by friendly fire, and reportedly expected to survive. Simonsen was shot while retreating out of the store, the commissioner said. News 12 is told he was shot multiple times.
"We're going to be looking for the public's help in getting more information about him, about what he may or may not be involved in", Chief of Department Terence Monahan said.
Christopher Ransom was also hit with charges for robbery, aggravated manslaughter and menacing. "The shock that they are feeling was so painful to see".
O'Neill added that the blame for the tragedy still rests with Ransom, saying that the 42-year-old veteran would still be alive if not for the career criminal's actions. The other officer's condition wasn't immediately clear, but officials said there was concern about his injury. "Because he's the delegate in the 102nd Detective Squad and today was the delegates meeting, this morning he was actually excused from duty". Then the cops came out and put one guy in an ambulance'. Brian Simonsen is shown. "That bravery and that resolve is something that we all need to understand". "On behalf of all New Yorkers, I offer my deepest sympathies to Detective Simonsen's loved ones and fellow members of the NYPD".
Officer Miosotis Familia, 48, was writing in her notebook when ex-convict Alexander Bonds strode up and shot her through a window.
The last NYPD officer killed in the line of duty was a 12-year veteran and mother of three who was gunned down in 2017 while sitting in a police vehicle.
The detective and sergeant fired, and as they were leaving the store, the detective was apparently shot by uniformed officers.