The Big Apple continued to be rocked by gun violence Saturday with the fatal shooting of a man on the Upper West Side — the third murder in the city in just over a seven hour span.

Police found the unidentified 58-year-old victim, near W. 101st Street and Amsterdam Avenue at around 12:42 a.m. with a gunshot wound to the chest, cops said.

He was taken to Mount Sinai Morningside hospital, where he was pronounced dead, police said.

The NYPD is still searching for the shooter.

The incident happened just under two hours after Jaheim Guinn, 17, was shot in the head outside his Dean Street apartment in Brooklyn, at around 10:20 p.m. Friday.

Guinn’s grieving family refused to speak Saturday as they sobbed on the sidewalk where he was killed — and then turned their anguish into violence, slugging a reporter from The Post in the head.

“I lost my son,” said Guinn’s mother as she wept in the arms of a man who came out of the building.

The mom declined comment before charging at the journalist, who was walking away. Nearby officers restrained the women before her daughter assaulted the reporter from behind. No arrests were made.

And earlier that evening, Ancil Blackman, was fatally shot in the face at around 5:30 p.m. outside the Miller Evangelical Christian Union Church on President Street in Crown Heights.

Neighbors remembered Blackman, 39, as boastful, confrontational but also caring, a man intensely proud of his Trinidadian roots.

“He was always saying ‘I’m not afraid of anybody. I will shoot somebody.’ He always [told] people what he used to do in the Caribbean. I used to tell him to stop saying that because you don’t know who has a gun,” said one woman who knew him.

Still, he had a softer side.

“This is a guy that if he saw me coming with my shopping cart, he would help me up the stairs, because he knew I’m sick,” she continued.

Another neighbor said: “He is the type of person that if he sees kids from the neighborhood, he would give them money to go to the deli and get something to eat. He looked out for everybody.”

In all, there were 10 people hurt Friday from 8 shootings citywide, police said.

And the spate of shootings continued Saturday, when a 26-year-old was struck in the leg at around 3 a.m. at the intersection of Hendrix Street and Belmont Avenue in East New York, cops said.

The victim, who is expected to survive, walked into Brookdale Hospital, where he told workers he heard gunshots and was in pain — and then realized he’d been shot, according to authorities.

The month got off to a start as bloody as its ending.

On July 1-2 four men were murdered in a less than three hour stretch — three of them by gunfire.

As of July 24, there were 219 homicides citywide, compared to 173 for the same period the year before, police data shows.