A recent investigation into the disappearance of missing teen Natalee Holloway yielded new human remains. Natalee’s parents held out hope the remains belonged to their daughter, but a subsequent forensic analysis proved they were not a match. Now, the sister of another missing woman says she’s determined to figure out if they might belong to her.

Maryland native Robyn Gardner went missing in August 2011 at a resort in Oranjestad, Aruba. The 35-year-old told her boyfriend she was headed to Florida with her parents, but instead, went to the Caribbean with a 50-year-old man named Gary Giordano. Two days into their trip, Giordano told police Gardner was swept away by a strong current.

Giordano maintained that Gardner had drowned, but was arrested attempting to fly back to the United States and imprisoned in Aruba for four months. A judge later released him for a lack of evidence. Now, Gardner’s sister wants to see if the remains found as part of the investigation into Natalee Holloway might belong to her.

“I am going to submit my DNA in the next few days to see if there is a match,” Danielle Colson-Unglesbee told HuffPost Thursday.

The investigation into Holloway turned up the fragments of four bones at an undisclosed location in Aruba. Forensic analysis completed this month showed only one of the bones was human. Testing also revealed that although the remains didn’t belong to Holloway, they belonged to Caucasian person of European descent.

“We don’t know how old that person is,” lead forensic scientist Jason Kolowski told Oxygen. “We don’t know how long that person has been dead.”

Testing the bone fragments against Gardner’s sister, however, would confirm whether or not they belonged to the missing woman.

Gardner is now presumed dead. And although Giordano remains a free man, Aruban authorities still consider him the main suspect in Gardner’s disappearance. Colson-Unglesbee has also long thought Giordano was responsible for her sister’s death, calling him “the snake and the devil” in 2014.

“If you cared about Robyn, you’d stay there longer and look for her,” Colson-Unglesbee told Giordano while confronting him on Dr. Phil in 2014. “If it were my husband that was missing, I’d be there for a long time looking for my sister.”

Two other people have since drowned in the same spot where Gardner allegedly got swept away, according to WJZ-TV.

“I had nothing to do with her disappearance — her drowning,” Giordano told WJZ. “I mean, she drowned. That’s all there is to it. She didn’t disappear, she isn’t living somewhere else – she drowned.”