Marion County sheriff's investigators were in Kentucky Monday, interviewing the person alleged to be the last person to see Dattilo.

Monday would have been Molly's 24th birthday.

To remember her birthday and to renew hope in finding her, Dattilo's family released balloons Monday morning in Military Park. Datillo's friends want people to know she is still missed.

"We don't have any answers. We don't know where she is. All we can do is stay positive and all we can do is just keep hoping and keep praying," Datillo family friend Shelley Fitzpatrick said.

The 5-foot, 100-pound Dattilo went missing July 6, 2004, from her far west side apartment complex.

Friends said she just disappeared, leaving her cell phone, her clothing, books, and bank account behind.

Family and friends organized multiple searches. National organizations representing missing adults also have conducted their own searches for Datillo.

According to the Marion County sheriff's department, investigators are pursuing the strongest lead in Kentucky.

"We hope the person can provide us with some information that will help us bring this to closure. But, he's definitely not a suspect at this point," Capt. Phil Burton said.

An anonymous donor has offered a $100,000 reward for information that leads to an arrest, a conviction, or the recovery of Dattilo's remains.

In the meantime, the Dattilo family and her many friends refuse to give up hope.

Earlier this month, a national missing persons group arrived in Indianapolis and conducted three days of extensive searches of the city's west side.

Private detectives, criminal profilers and even psychics have weighed in on the case. Yet, Dattilo's disappearance remains a mystery.