Amy Bradley's brother reveals last words he said to her before she went missing on cruise ship

As Amy Bradley's disappearance reaches international recognition almost three decades since she went missing on a cruise ship, her brother has revealed the last words he said to her.

The 23-year-old was vacationing with her parents and sibling when she vanished without a trace from the balcony of their room aboard Royal Caribbean's Rhapsody of the Seas in the early hours of the morning on March 24, 1998.

The Petersburg, Virginia, native was last seen sleeping in a chair at around 5.30am but roughly 30 minutes later, as the vessel prepared to dock in Curaçao, a Caribbean island located just 40 miles off the coast of Venezuela, she was nowhere to be seen.

Now, her brother Brad has revealed the final moments they shared together as he recalls visiting the Country of Aruba - an island 70 miles to the west of Curaçao.

Brad and Amy enjoyed touring the Country of Aruba on their final day together (amybradleyismissing.com)

The pair toured the breathtaking island in a convertible SUV they rented before returning to the ship as they got ready for a formal dinner with their parents, Ron and Iva, at a party on the pool deck.

They then headed to the rooftop club, where they partied with other guests before retiring to their family's cabin together at 3.30am.

"I don’t remember looking at a clock, but at 4[am], maybe 4.10[am], I went to bed," Brad told People.

Before revealing that he told his sister, 'I love you' - a phrase he now feels fortunate enough to have said to his sibling, as it was the last thing he ever said to her.

Amy and Brad pictured with their parents, Rona and Iva, on the Rhapsody of the Seas liner (amybradleyismissing.com)

Since Netflix released its true crime documentary, a three-part series titled Amy Bradley is Missing, one of the two directors, Ari Mark, has revealed that he has been receiving 'tip-offs' on the alleged whereabouts of Amy - who would now be 51 years old.

"There have been tips actually coming in that I can't publicly share," Mark told CBS Mornings.

"Obviously, when you get this sort of exposure and you're on a platform like Netflix, and it has the incredible reach that it does, you're going to get a lot of people out there who are going to want to help - and we've activated them.

"That was the point of this, but we also want to be really careful about vetting those tips carefully and making sure that law enforcement is involved. So, you know, it's definitely a process, but hopefully something shakes loose."

The FBI is offering a reward of up to $25,000 for any information leading to her recovery.