For those four months, investigators grilled Giordano on what they called his suspicious response to Gardner's disappearance. He was arrested on Aug. 5, but has maintained that she was pulled out to sea while they were snorkeling off the Caribbean island after a day of drinking.
Just after her disappearance, Giordano is seen in surveillance video, almost casually knocking on the doors of a local restaurant for help.
Also leading authorities to suspect Giordano is a $1.5 million travel insurance policy purchased for Gardner, which names him as the sole beneficiary and was taken out the day before the two flew to Aruba.
In September, Giordano was denied release from jail after evidence surfaced suggesting he was eager to cash in on the American Express travel insurance policy.
"[He] sounded excited, like he was about to win something," a representative from American Express insurance who spoke to Giordano told the FBI.
According to Stein, the investigation will continue whether Giordano is held in Aruba or not. Aruban authorities have already spent millions investigating Gardner's disappearance. After using cadaver dogs and helicopters to comb the island, the cost of the investigation is already far greater than the budget for the Aruban Justice Ministry.
"We will still be with it. It's something we feel we need to do not only so justice is served but so the family can learn what happened to Robyn," said Stein. "They deserve answers and we are determined to bring answers to them."