After experts determined a bone found in Aruba did not belong to missing Alabama teen Natalee Holloway, the sister of another woman who went missing on the island is trying to determine if it might be a lead in that case.

As CrimeOnline previously reported, Holloway’s father and a private investigator reported their ongoing investigation into the death led to the discovery of human bone fragments earlier this year.

The bone in question was first revealed as part of the promotion for “The Disappearance of Natalee Holloway,” a documentary program airing on Oxygen. It was allegedly found by a man named Gabriel Madrigal and John Ludwick, who was friends with Joran van der Sloot, a suspect in Holloway’s disappearance.

When analysis revealed the bone did not belong to Holloway, who has been missing since 2005, Danielle Colson-Unglesbee decided to act, according to HuffPost.

“I am going to submit my DNA in the next few weeks to see if there is a match,” said Colson-Unglesbee, whose sister, Robyn Gardner, disappeared from the same town in Aruba in 2011.

The 35-year-old Bethesda, Maryland, woman was reportedly at a resort in Oranjestad with Gary Giordano, 50, who told police they were snorkeling when Gardner was swept deeper into the ocean with the current. He was initially held in connection with the disappearance but was later released due to insufficient evidence.

Her sister’s latest mission received some support online as individuals familiar with the facts of the Halloway and Gardner cases revisited some key similarities between the two disappearances.

T.J. Ward, the private investigator working with Holloway’s family, said that if the DNA evidence shows a match, police would take a renewed interest in the possible involvement of both Madrigal and Ludwick.

“If those remains come back and [are] linked to Robyn Gardner and they were in their hands … I guarantee the FBI will snatch ’em up,” he said in an interview with HuffPost.

For his part, Madrigal said he remains committed to finding Holloway’s remains based on a series of clues he said Ludwick has given him.

“He gave me 12 clues,” he said. “I put the clues together and I know. I’m going to do this. I won’t quit.”

So far, forensic experts have only determined the evidence came from “a single individual” of suspected “Caucasian European ethnicity,” according to a HuffPost source.

Meanwhile, Colson-Unglesbee holds out hope that her “family can find closure” in the ongoing search for Gardner.

“I think about Robyn every day and will continue to think about my memories of her for the rest of my life,” she said.

[Featured image: Facebook/Help Find Robyn Colson – Gardner : Missing in Aruba PAGE 2]