The beach has been closed to swimming.
Mr Medici, who is the first man to be killed in the state in more than 80 years, came to America for college two years ago. He described how the late victim kicked something behind him, before a tale emerged from the water.
Two people look out at the shore after a reported shark attack at Newcomb Hollow Beach in Wellfleet, Mass, on Saturday, Sept. 15, 2018.
"It was like right out of that movie Jaws. This has turned into Amity Island real quick out here", he admitted to WBUR.
Booth said it was a quiet day at the beach, and he saw some people boogie-boarding before he noticed some commotion in the water.
Surfer Andrew Jacobs shared video of dozens of Good Samaritans carrying the victims body away from the water.
The unidentified swimmer, a man in his mid-20s, was given first aid, including CPR, but died at Cape Cod Hospital in Hyannis.
The last fatal shark attack in MA happened in 1936.
Sightings of great white sharks have soared this year in Cape Cod, where the suspected shark attack happened. The swimmer, William Lytton of Scarsdale, N.Y., was wading about 30 yards off of the shoreline when he was bitten - becoming the first person to be attacked by a shark in MA waters since 2012, according to WBUR.
"Further information will be released by the District Attorney's Office", the police department said.
"The inshore waters off Wellfleet are a feeding ground for Great White Sharks", the sign reads.
The attack occurred on Saturday near Newcomb Hollow Beach on Cape Cod.
On Saturday, with sunny skies and warm temperatures, Newcomb Hollow Beach was busy, even though summer season was over and lifeguards were not on watch.
The man suffered "injuries to his lower extremities", an off-duty lifeguard told The Cape Cod Times. Lytton was airlifted to Tufts Medical Center in Boston, where he was treated for deep puncture wounds to his torso and leg.
Barnstable county commissioner Ron Beaty said he had warned something like this could happen.