Officials in Costa Rica, however, said they are still waiting on a fingerprint match from the Federal Bureau of Investigation to officially confirm the identification.
A security guard was also detained as part of the murder investigation, the Costa Rican Judicial Investigation Department confirmed to the news outlet.
Stefaniak, 36, was on a trip to celebrate her birthday with her sister-in-law and friend, April Burton.
- Family members of a Florida woman, who went missing in Costa Rica for days, said her body was found near the Airbnb she was staying in, but authorities are still waiting for an official identification through a fingerprint match.
Blood was found inside the apartment.
On the Facebook page they created for her disappearance, Stefaniak's family accused the local officials and U.S. Embassy in Costa Rica of not effectively "pursuing the matter" because "they feel she was rational at the time of her disappearance and got into a taxi of her own free will".
The woman was last heard from around 8:00 p.m. that night, when she texted Burton saying her Aribnb was "pretty sketchy" and the power had gone out because of the heavy rain. She didn't show up for her 1 p.m. flight home on November 28. Her body, covered in plastic bags, was discovered Monday about 300 yards from the Airbnb where she stayed. "Her mom is absolutely devastated".
"It was her birthday, and she loves to be on social media", Stefaniak's brother, Carlos Caicedo, told CBS News. When that final phone call to a friend abruptly ended November 27, friends and family initially chalked it up to bad weather or a broken phone, but Jaime said Stefaniak always traveled with her iPhone, iPad and computer.
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Walter Espinoza, head of the country's Judicial Investigation Department, told reporters that Stefaniak was killed by a blunt force trauma to the head and that 32-year-old Bismarck Espinosa Martinez has been arrested, according to NBC. "We know she was abducted".
So Stefaniak dropped off the rental auto and Antonieta at the airport, then ordered an Uber to take her to her AirBnB where she planned to stay until her flight the next day.
Authorities in Costa Rica, he is from Nicaragua and worked as a security guard at the vacation rental property where Stefaniak was staying. "That's the last we heard from her".
On Monday, officials revealed a body was found buried in a wooded area less than 200-feet behind Carla Stefaniak's Airbnb.
Burton added: "For nearly six days to go by and no contact, she would have to have been abducted".
Both Caicedo and his wife, who had been traveling with Stefaniak, are skeptical she would leave that early because her flight wasn't scheduled until more than eight hours later.
She later communicated with a friend via Facetime and said that she wanted to go out that night but was too exhausted.