"And I was like, 'Come get the baby out of the water, '" she said.
The baby was pronounced dead at New York-Presbyterian/Lower Manhattan Hospital, the Times reported.
A baby boy was found unresponsive in the East River near the Brooklyn Bridge on Sunday, prompting New York City officials to launch an investigation into the child's death. "I called 911. At that point, I thought it was a doll", Monte Campbell said.
Police say the child was found laying on an embankment at the water's edge.
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MACC and Najib's spokesman did not respond to a request for comment. Najib, who set up and oversaw 1MDB, denies any wrongdoing.
Austin's mom, Diane, was the first to spot the baby in the water shortly after 4 p.m. "They kept asking if any parents were around but it was just the baby out there in the water, nobody around", said one witness at the scene.
"There was no pulse, no respiration", Campbell, a chiropractor, said.
Campbell and the officers tried to revive the baby using CPR until an ambulance arrived and rushed him to NewYork-Presbyterian Hospital/Lower Manhattan, where he was pronounced dead, police said.
The location near the South Street Seaport on the heavily-trafficked East River, a tidal estuary subject to strong currents, divides Manhattan from Brooklyn. The cause of death will be determined by the medical examiner.