The groom survived but his brother, Sergio Lorenzo, and three Miami-area friends - Ernesto Sierra, Jorge Caso and Andres Denis - were carried away by the rushing water, Today reported.
A white-water rafting excursion in Costa Rica turned deadly on Saturday when rafts carrying a bachelor party flipped, sending the group careening down a flooded river.
The 14 men boarded three separate rafts around 15:00 local time, which all capsized within five minutes, they said. The Americans were aged 25 to 35. A fifth person, a Costa Rican guide - Kevin Thompson Reid - was also killed.
A rafting accident on October 20 in Costa Rica left four Americans dead in addition to their guide, the U.S. State Department confirmed.
The Americans had arrived in Costa Rica October 18 and had been renting a house in Playa Hermosa de Jaco, according to the government. "All of us struggled to stay above water, swallowing lots of it on the way down".
Other passengers managed to cling to the rafts and some were rescued by another guide in a kayak. "Most of us were ultimately able to grab hold of rocks or barriers in or around the water and await the rescue teams to get to us", Comas said of the ordeal.
"We are saddened by news of rafting accident in #CostaRica".
Costa Rica has experienced heavy rains in the last month, causing the river's water levels to become dangerously high, authorities said.
Costa Rica's President Carlos Alvarado expressed his "dismay" at the incident and said in a statement that he had instructed authorities to provide all necessary support to the victims' families.
Earlier this month, a MA man who was celebrating his honeymoon in Costa Rica was killed by flooding in Playa Dominicalito when he attempted to drive across a submerged bridge.