"This was completely separate and before the girl was killed in Peru," Peggy Sanford, a spokeswoman for the U.S. Attorney's Office in Birmingham, told ABCNews.com last month. "This investigation had been going on. It was a complete coincidence and tragedy that the other woman was murdered."
In an interview obtained exclusively by "Good Morning America," van der Sloot's mother, Anita van der Sloot, said she would apologize to Flores' family.
"I hope that he gets a chance to talk with the parents of Stephany Flores, and that he can tell them what happened. And I apologize for them ... that he's my son. He's not a monster. He can be very gentle, but it could be that he has bipolar personality. I hope he gets the help," she said last month.
Anita said her son was not supposed to go to Peru at all, but to a mental institution in the Netherlands for treatment.
"He left me a note. Like, 'Mommy, I love you but I don't want to go to the Netherlands. I'm invited to gamble in Peru and I can make money there and I want to stay there. Just far away. Nobody knows me there. I want to think what I want to do with my life.' So ... I was very angry," she told a Dutch television crew.
She was shocked when she learned that, while on his trip to Peru, her son had been accused of killing a young woman.
"I believe in karma, I believe that very strongly. I believe that if you do things that you shouldn't do, that a lot of s**t happens to you," she said. "He didn't want to listen to his parents. He didn't listen to me, this last time. I tried to do my best. I don't think I could have done more. He's considered an adult right now. He has to do whatever he needs to do, and that is tell the truth (about) what happened."
ABC News' Russell Goldman contributed to this report. Click here to return to the "Good Morning America" website.