The death of cruise ship singer Jackie Kastrinelis remains a mystery, despite authorities ruling out foul play.

The body of Kastrinelis, a 24-year-old native of Groveland, Mass., and a singer on the Regent Seven Seas Voyager cruise ship, was found Sunday morning while the boat was docked in Australia, ABC News reported.

Regent gave the following statement on the death of the cruise ship singer:

"The Regent Seven Seas Cruises' family is deeply saddened by the unexpected passing of Jackie. Our hearts and prayers go out to her family and loved ones.”

Those loved ones said it was difficult to come to grips with the mystery surrounding the cruise ship singer’s death.

“Everyone’s just completely shocked,” Ben Wilcox, a friend of Kastrinelis’s from the University of Hartford, told ABC News. "She was energetic, bubbly and friendly on camera, but that was also the case off camera."

Local authorities established a crime scene in the cabin where the cruise ship singer’s body was found, but they are no longer viewing Kastrinelis’ death as a murder, The Daily Mail reported.

“The Crime Division is no longer treating the death as suspicious,” said Det. Superintendent James O’Brien of the Northern Territory Police.  “Further toxicology results will be analyzed in due course to determine the exact cause of death.”

Kastrinelis worked as a singer for Jean Ann Ryan Productions, a company that supplies talent to cruise ships, Cruise Law News reported.

The website said the cruise ship singer was aboard the Seven Seas Voyager “for a relatively short period of time.” It said she also worked on other Regent ships.

Kastrinelis’s family was set to go to Australia on Thursday as the cruise ship singer’s body undergoes an autopsy, according to ABC News.

The family was said to be “devastated” by the cruise ship singer’s death, the Eagle-Tribune reported.

“She was eccentric and quirky,” Donald Greaney, a Groveland politician and friend of the Kastrinelis family, told the paper of Jackie’s personality during her childhood. “Back then, people thought she was odd until being your own person became cool.”

The Massachusetts native’s family is not just relying on police to solve the mystery of their daughter’s death.

Chris Stein, Kastrinellis’ uncle, has been tapped as the family’s spokesman and is collecting tips and other information that may solve the mystery of the cruise ship singer’s death. Colleagues of Jackie Kastrinelis or crew members of the Seven Seas Voyager who have information on her death were urged to contact Stein at or 508-696-8968.