LOUISVILLE, Ky. (WDRB) – Parents of a teenage girl missing since early September are begging someone to come forward with information.

Helen Parr, 17, went missing from her home on Shelby Road near the Louisville  Zoo either late at night on Sept. 2 or in the early morning hours of Sept 3.

“At first, we thought maybe she’d taken the dogs out in the backyard or was sitting on the deck,” her father Robert Parr said.

However, Helen was nowhere to be found.

“Your mind kind of goes into overdrive at that point,” he said.

The Parrs say Helen left most of her belongings behind. The only thing they can’t find is her learner’s permit. Since then, LMPD has activated Operation Return Home.

“As you're giving a report to the officer, and he starts asking if she has dental records, it kind of hits home,” Parr said.

Her family has hired a private investigator to help find information about where Helen might be, but so far, there have been no leads and no tips.

“When I lay down to go to sleep at night, the first that hits me is where is she sleeping? Is she OK?,” Robert Parr said.

Now, three billboards around the area have Helen’s face on them to help lead to tips.

“You have to hold onto hope,” her mom Micki said. “You don't really have a choice, otherwise you'll drive yourself crazy.”

Parr is a white female weighing 125 pounds. She's 5 feet 4 inches tall with hazel eyes, sandy hair and braces. She has a heart condition that can lead to cardiac arrest.

A fundraiser is planned for Saturday at 10 a.m. at the Louisville Zoo to help raise money for additional search efforts as well as a reward for information leading to her being found.

“We want her back home,” Helen’s mom said. “She’s part of us. I don't think we'll ever be a whole family without her.”

Anyone with information about Helen Parr’s whereabouts is urged to call LMPD at 574-LMPD or private investigator Tracy Leonard at 502-618-9337

Copyright 2016 WDRB Media. All rights reserved.