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.
The incident happened at Newcomb Hollow Beach around lunchtime on Saturday (US time).
Saturday's attack was the third fatal shark attack in the world this year, with the other two occurring in Brazil and Egypt, according to Gavin Naylor, director of the Florida Program for Shark Research and curator at the Florida Museum of Natural History.
Police identified Medici Saturday evening and authorities closed the beach following the attack.
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.
"It's really sad", Wellfleet Select Board Chairwoman Janet Reinhart said. "To the victim's family, we offer our honest condolences". "We share the grief and pain you feel". He was soon brought to shore, where CPR was performed on him while waiting for emergency officials to arrive. "Today we lost a member of our community and we grieve his passing". "Going forward, I will be convening meetings w/the National Park Service and coordinating w/state and local officials on how best to address this issue".
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"There's no evidence sharks consider people food". These fish are apex predators in temperate marine ecosystems. He was boogie boarding when a shark suddenly attacked him, according to a report by MassLive. The type of shark involved was not immediately known.
In August, a man was bitten by a shark at Long Nook Beach.
Barnstable County Commissioner Ron Beaty said he had warned something like this could happen and urged measures to reduce the number of white sharks. Newsweek reported that the animal was 17 feet in length.
Chris Hartsgrove, acting deputy chief of Cape Cod National Seashore, said the injuries appeared to be from a shark.
Gavin Naylor, the director of the program, said such attacks are "very rare" and that "shark attacks in the summer are a direct outcome of more people and more animals in the water".