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After British flight attendant Sarm Heslop vanished from her boyfriend's luxurious catamaran, the 47-foot Siren Song, he sailed out of U.S. territorial waters and had the freezer replaced in Grenada, according to her family's private investigator.

Heslop was last seen alive three years ago Thursday, leaving a restaurant in the U.S. Virgin Islands with boyfriend Ryan Bane. Searches of land and sea came up empty, and despite the mystery surrounding her disappearance, police never searched the vessel.

David Johnston, a decorated former London homicide squad commander and hostage negotiator, is assisting Heslop's parents free of charge.

"We know he went to Grenada afterwards and had the freezer replaced on the boat. Why?" the Queen's Police Medal recipient pondered in a phone interview. "We know he had other parts of the forecabin replaced. Why?"

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Ryan Bane standing shirtless on the back of his boat

Ryan Bane, lover of missing British woman Sarm Heslop, aboard a yacht at the Le Phare Bleu Marina on the island of Grenada. Bane has been described by police as a "person of interest" in the disappearance of Heslop, a former FlyBe air stewardess who was last seen March 7, 2021. (Backgrid)

"He literally and metaphorically sails off into the sunset unchallenged, without anybody actually asking him for a full account of what actually happened."

— David Johnston

Those questions remain unanswered because local police failed to obtain a search warrant for the vessel before Bane sailed out of their jurisdiction and is believed to have sold it, Johnston said.

Johnston told Fox News Digital Heslop's parents now consider her the victim of foul play and not a missing person. But they have been cut off by the island's police and political leadership, he said.

"Sarm likely is dead, and her death was untimely and could have been a murder," he said. "It could've been an accident, but no one will speak with us."

Sarm Heslop seated on a rope swing

Sarm Heslop poses on a rope swing in the U.S. Virgin Islands in an undated photo shared to Instagram. The U.K. native has been missing since March 8, 2021, after she was last seen leaving a bar on St. John in the U.S. Virgin Islands. (Sarm Heslop/Instagram)

He said he first offered his assistance to Heslop's parents about 18 months ago and tried to engage USVI Gov. Albert Bryan Jr. and Virgin Islands Police Commissioner Ray Martinez. But he was unable to get results and says they'd stopped responding to the family and his own attempts at making contact.

"I've been spun along for the last 15 months by the governor and Ray Martinez, who said, 'You're welcome to come and look at the seat, but we're not going to talk about the inquiry. It's an active investigation, and we don't discuss active investigations," Johnston said. 

"OK, so what are you doing, actually? ‘Oh, we can discuss that.’ Well, there is nothing being done actively."

Ryan Bane walks in Grenada

A U.S. citizen living in Grenada said Ryan Bane was seen multiple times in the Caribbean nation in the fall of 2021, months after Sarm Heslop vanished from his catamaran in the U.S. Virgin Islands. (Provided to Fox News Digital)

Martinez has been criticized for failing to address "rampant crime" in the Caribbean nation, a U.S. territory, according to the Virgin Islands Consortium, a local newspaper. In November, he earned the ire of Virgin Islands lawmakers after snubbing them during a public safety hearing.

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"Ray Martinez wasn't in charge when Sarm disappeared, so he had the option, perhaps, to put right some of the things that weren't right," Johnston said.

Early missteps included failures to collect cellphone or location data from the yacht or devices belonging to Heslop or Bane, he said.

Sarm Heslop seated on a boat

Sarm Heslop seated on a boat. The globetrotting U.K. native has been missing since March 8, 2021, after she was last seen leaving a bar on St. John in the U.S. Virgin Islands. (Sarm Heslop/Instagram)

"At very minimum, [Bane] should have been interviewed under caution," he added, referring to the British version of a Miranda warning.

"Who knows what happened on that boat?" he asked. "But from my experience of 30 years of being a cop, he is a person of significant interest, and he has some questions to answer. And until he does that, he should remain as the most likely suspect in her disappearance and possible death."

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Glen Dratte, a spokesman for the department, dismissed the validity of private investigations in general.

Ryan Bane at Gym in workout clothes

Ryan Bane at a gym in Lake Orion, Michigan, in February, when two men confronted him about both a 2011 domestic violence incident against their cousin and the unsolved 2021 disappearance of Sarm Heslop. (Gary Stevenson)

"Question," he wrote to Fox News Digital in an email. "Can a private investigator from the U.S. Virgin Islands go to Scotland Yard (U.K.) and conduct an Investigation?"

He said there have been no new developments in the case and that previously collected evidence has been shared with prosecutors.

"The Virgin Islands Police Department continues to keep our thoughts and prayers with the family, friends and colleagues of Sarm Heslop," he added.

grenada boat close

A tipster spotted the Siren Song catamaran at a dock in Grenada months after Sarm Heslop's disappearance from the vessel when it was moored in the U.S. Virgin Islands. (Provided to Fox News Digital)

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Although the boat is believed to have been sold, cleaned and partially remodeled, Johnston believes it may still have some forensic value if investigators sought to locate it.

As for Bane, he has returned to his home state of Michigan, where his ex-wife's cousins confronted him last month after he approached them in a gym in Lake Orion.

Siren Song

The Siren Song moored in St. John, U.S. Virgin Islands, as seen in aerial drone footage in March 2021. (FindSarm.com)

The men said Bane approached one of them before they began taking pictures of him and asked if he'd "killed anyone lately."

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The yachtsman was convicted in 2011 of domestic violence against his wife at the time, Corie Stevenson, who came forward with her story after learning of the circumstances surrounding Heslop's disappearance.

Ryan Bane in blue prison jumpsuit mugshot

The booking photo from Bane's 2011 domestic violence arrest. (Oakland County Sheriff's Office )

Bane and Heslop left the 420 for Center Bar in Cruz Bay around 10 p.m. March 7, 2021. Police have reviewed, but not publicly released, surveillance video that shows the couple headed to Bane's dinghy a few minutes later. Around 2:30 a.m. the following morning, Bane called VIPD to report Heslop missing. He was told to alert the U.S. Coast Guard if she'd fallen overboard.

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He called the USCG between nine and 10 hours later but refused to permit responding service members to search the cabin of his boat.

Sarm heslop smiles in black jacket

Sarm Heslop smiles in an undated photo provided by her friends and family, who have banded together to demand answers in her unsolved disappearance. (FindSarm.com)

Then he hired the high-profile attorney David Cattie, who previously represented Jeffrey Epstein's accomplice, Ghislaine Maxwell.

Cattie previously told Fox News Digital his client would return to the Virgin Islands if his presence was "legally required."

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"Mr. Bane had nothing to do with Sarm’s disappearance and remains heartbroken that she is missing," he said.

Bane has not been charged with a crime in Heslop's disappearance.

While the Virgin Islands Police Department has jurisdiction over local offenses, the FBI urges anyone who believes they are a witness or victim to a federal crime to call them directly at 1-800-CALL-FBI or to call the local field office in San Juan, Puerto Rico.

Additionally, the U.S. Coast Guard says anyone who needs help in U.S. waters should reach out over VHF radio on channel 16 with their GPS location and the nature of their emergency.