A young mother walking with her baby in New York was shot and killed after a gunman attacked her from behind, authorities say.

At about 8:30pm on Wednesday night, near Lexington and East 95th Street, a 20-year-old woman pushing her months-old child in a stroller was approached from behind by a hooded gunman, who then fired one fatal shot into the back of her head, police say.

The shocking murder came just days after the Supreme Court struck down a New York law that requires people to demonstrate a particular need for carrying a gun in order to get a license to carry one in public. The justices said the requirement violates the Second Amendment right to “keep and bear arms.”

During a news conference following the shocking murder, New York City Police Commissioner Keechant Sewell the victim was rushed to Metropolitian Hospital in crtitical condition. She was pronounced dead approximately an hour after arriving, he added, without identifying the victim.

The child, who was in the stroller at the time of the attack, was reportedly unharmed, officials said.

The suspect remains at large and is described as having been dressed in all black and a hooded sweatshirt. There was no word on a possible motive.

The brazen murder took place in one of the city’s most affluent neighbourhoods and just blocks away from a playground, where kids playing reportedly heard a loud “boom” that they only later processed as being a gunshot when they saw the terrible scene that had unfolded, according to the DailyMail.com.

“I was really confused, because I thought maybe this was fireworks. But then I realized that no, this is serious and that there was a gunshot,” a 10-year-old girl in the area told the Mail.

Later in the evening, New York City Mayor Eric Adams attended a press conference at the scene of the violent crime and laid the blame of the stunning murder at the feet of the city’s “problem of the over-proliferation of guns on our streets”.

“When a woman is pushing a baby carriage down the block, and is shot at point-blank range, it shows just how this national problem is impacting families,” Mr Adams said, according to CBS News. “It doesn’t matter if you are on the Upper East Side, or East New York, Brooklyn. The oversaturation of guns endangers people.”

On Thursday, in a 6-3 decision, the justices’ of the Supreme Court determined that the New York law that required people who seek to carry a concealed weapon to receive a permit, considered to be one of the country’s most restrictive laws, to be unconstitutional. The decision is expected to ultimately allow more people to legally carry guns on the streets of the nation’s largest cities — including New York, Los Angeles and Boston — and elsewhere, as about a quarter of the US population lives in states expected to be affected by the ruling, the high court’s first major gun decision in more than a decade.

With files from the Associated Press

A 20-year-old mother was pushing her 3-month-old baby in a stroller on Manhattan’s Upper East Side when a gunman approached from behind and fatally shot her once in the head. Police say the infant was unharmed. NBC’s Emilie Ikeda reports for TODAY on the tragedy.

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Ed Jones/AFP via GettyA 20-year-old woman was fatally shot in the head while walking through the Upper East Side neighborhood of New York City on Wednesday night, police said.The woman was pushing a stroller when she was attacked, according to a spokesperson for Mayor Eric Adams’ office. A man approached her from behind, shot her once in the head, then ran from the scene, authorities told CBS New York.She was transported to a local hospital, where she was pronounced dead, according to multiple r

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