A body found floating in a New York City creek has been identified as missing Goldman Sachs staffer John Castic, his father told Fox News Digital. 

Castic, 27, was last seen Saturday about 2:30 a.m. leaving a Zeds Dead concert at The Brooklyn Mirage in the East Williamsburg neighborhood.

"They have found his body and confirmed it's him," his father, Jeffrey Castic, told Fox News Digital. "It appears to have been death by misadventure. His wallet and phone were found on him."

NYPD detectives called the family a little after 2 p.m. Tuesday to deliver the news.

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A gray and brick warehouse in Brooklyn.

John Castic went missing July 29 after attending a concert at The Brooklyn Mirage, pictured. (LinkedIn / Google Maps)

A passerby spotted Castic's body floating in a section of Newtown Creek called English Kills at 11:09 a.m. Tuesday and called 911, according to police.

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NYPD Harbor units arrived and pulled Castic from the water.

The DePaul University graduate had worked as a senior analyst for Goldman Sachs for about one year.

NYPD boats in the water coordinate to lift the body onto the boat

NYPD officers retrieve a dead body from Newtown Creek in New York City on Tuesday, Aug. 1, 2023. The body is thought to be that of missing man John Castic, who was last seen at The Brooklyn Mirage on July 29. (Peter Gerber)

"He was so smart but, in the end, he did something dumb, and it cost him," Jeffrey Castic told Fox News Digital. "We think he might have been impaired, we do not know, and it was just a lapse of judgment."

The city's medical examiner will perform an autopsy and determine Castic's cause of death, police said in a statement. The investigation is ongoing.

Another man, psychologist Karl Clemente, 27, vanished from the same music venue on June 11 and turned up dead five days later in Newtown Creek.

Google map of Newton Creek

John Castic's body was found in English Kills, a section of Newtown Creek, near where Karl Clemente was also found in June. (Fox News)

Clemente's father isn't so sure it was an accident and said he thinks that the two cases could be linked.

"There’s something weird here," Alex Clemente said. "There might be some connection."

Staffers at the venue turned away Clemente because they said he had been drinking, his father told Fox News Digital.

Video surveillance shows him walking toward a nearby gas station, but there was no footage of him inside.

Additional footage recorded minutes later reportedly shows Clemente running down Metropolitan Avenue.

NYPD boats in the water coordinate to lift the body onto the boat

NYPD officers retrieve a dead body from Newtown Creek in New York City on Tuesday, Aug. 1, 2023. The body is thought to be that of missing man John Castic, who was last seen at The Brooklyn Mirage on July 29. (Peter Gerber)

"Why was he running?" said Alex Clemente. "Someone was chasing him. There's something fishy here."

Unlike Castic, Clemente's wallet and phone were not found with his body.

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Police said the investigation into Clemente's death remains open.

Ashley Papa and Haley Chi-Sing contributed to this report.