An autopsy has been scheduled for the reputed "Bambino Boss," an alleged New York mobster whose body was reportedly dragged out of a river northeast of Montreal on Thursday.

Officers said they pulled the man from a shallow part of L'Assomption River shortly after 10:15 a.m. local time after a passerby spotted the body from the shore.

Police haven't officially named the victim but multiple reports have identified the body as that of Salvatore Montagna, a reputed former Mafia boss.

"When (police) arrived, they saw a man lying near the river, they took him out of the water and started doing CPR with the help of emergency personnel," Sgt. Benoit Richard told The Canadian Press.

Richard said the then-unconscious man was transported to hospital where he later succumbed to his injuries and was pronounced dead.

Witnesses told CTV Montreal that they heard glass breaking and multiple gunshots ring out shortly before police discovered the man's body.

One passerby reported seeing a man fall into the river after running away from a white van.

Montagna was born in Montreal but spent much of his childhood in Sicily, the same region in southern Italy that the infamous Rizzuto crime family hails from.

The FBI once called Montagna the acting boss of the Bonanno family. The Bonanno crime family is one of the five largest Mafia families in New York and reportedly had close ties to the Montreal Mafia.

James Dubro, an author and crime specialist, said Montagna was known as a "rising young Mafia boss" in New York City.

"He pretty much worked in the Bonanno family in drugs and extortion and various other things," Dubro told CTV News Channel on Friday.

The 40-year-old father of three was known to friends as Sal "The Ironworker" Montagna because his family owned a metal company in Brooklyn.

In April 2009, Montagna returned to Montreal after being deported from the United States for refusing to testify about illegal gambling.

Dubro notes that his return to Canada coincided with the start of a series of murders involving top-ranking members of the Rizzuto crime family.

"There've been a lot of bodies piling up in Montreal," he said. "A lot of lieutenants of Rizzutos have been killed."

It's been speculated that Montagna was embroiled in a power struggle for leadership of the local Montreal Cosa Nostra, which has been linked to the Bonanno family.

"It seems that Sal Montagna was working with other Sicilians and Calabrians…to try to consolidate but it's not certain. It's kind of a puzzle that's going on right now," said Dubro.

Police have said they will await the results of Friday's autopsy to determine the official cause of the man's death.

With files from CTV Montreal's Rob Lurie and The Canadian Press