The body, which was wrapped in plastic, was found Monday in a wooded area in the San Jose neighborhood of San Antonio de Escazu, near where 36-year-old Carla Stefaniak was last seen last week, according to CBS News.
Police say they are still waiting for tests to come back to be 100 percent certain.
Her sister-in-law, April Burton, said she last heard from Stefaniak around 8 p.m. last Tuesday.
Reports have confirmed that Carla Stefaniak, who disappeared in Costa Rica last week while she was on vacation, appears to have been found dead on the property where she had been staying. Guards at the Airbnb hotel she was staying told judicial investigators they saw her leave in a vehicle at 5:00 am Wednesday morning.
Stefaniak has been missing for more than a week after traveling to Costa Rica.
The last time her family heard from her was the night of November 27 when she texted her sister-in-law that the lights were going on and off. Relatives raised the alarm after she stopped texting and telephoning home and was not on her return flight from Costa Rica, where she had been vacationing.
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In an interview, family friend Greg Zwolinsky talked about the main concerns and questions that the family had about Stefaniak's disappearance. "Three hundred meters away we found her body". "It's pretty sketchy here", she wrote in a text.
Burton left the country on November 28, and Stefaniak's flight back to Florida was scheduled for the next day.
Police detained a security guard from the Airbnb where Stefaniak was staying after inconsistencies in his statements, Espinoza said. "We want the world to know that we will never forget Carla", the post on Finding Carla says.
Walter Espinoza, head of the country's Judicial Investigation Department, said tests are underway to determine whether the likely blood and the decomposing, half-buried body belong to the missing woman, Carla Stefaniak. Her father caught a flight from Tampa International Airport on Monday - not long before authorities in Costa Rica made the grim announcement that an unidentified body had been found not far from the Airbnb. The OIJ has not named a suspect in the Costa Rican's death.
The State Department is working on the case and are awaiting the results of an autopsy.
"Words can not express the devastation within her family and friends", the Facebook post said. "We checked her email and she did not take an Uber at 5.10am". We're going on six days not hearing from her.
That same night, she was Facetiming with a friend in NY when the call dropped about 9pm. Caicedo said something didn't add up because his sister's flight was scheduled for 1:30 later that day and she was "never early for anything".