HORRY COUNTY, SC (WMBF) – Heather Elvis' sister penned an emotional letter in honor of her sibling and posted it to Facebook on Thursday, her 23rd birthday.
The post from Morgan Elvis began by saying, "Heather, your belongings sit sealed tight in plastic containers inside your bedroom and in corners around the house."
Morgan Elvis went on to write she was grateful she and her sister grew up in a family, "so strong, so faithful."
"Happy Birthday Heather," Morgan Elvis wrote. "If there's one thing I want you to know, it's that I have and will always love you unconditionally, and given the opportunity, I'd trade me for you. Someday I'll be back by your side."
Debbi Elvis also has a message for Heather on her birthday.
"Tell her that I love her," she said. "I would love to just hug her one more time and that I'll never, ever stop looking for her. One day I will find her no matter what."
Elvis said one of her biggest fears is that people will forget Heather, but before she even got to Peachtree Landing Thursday, someone had already put up a happy birthday balloon.
"It means a lot that people are still supporting us after all this time," Elvis said.
She said she hopes that support network can help with another cause, the CUE Center for Missing Persons.
"They're a support system for the family," Elvis said. "They help them with online things. They help them with websites. They help them with listening to us vent because we don't know what to do. They understand this. They've seen it a thousand times and they've been through it."
Elvis launched a fundraiser for the CUE Center for Missing Persons in honor of Heather's birthday.
Details can be found here.
The event is mostly online, but Elvis spent time at Peachtree Landing Thursday to answer questions and collect donations.
"We don't feel like celebrating, but helping somebody else or something else or even helping do something for Heather is the only thing that makes us feel any better," she said.
Elvis also urges anyone with information about Heather's disappearance or any other missing persons case to come forward.
Last week, Terry and Debbi Elvis sat in a courtroom as Sidney Moorer, who is charged in connection with their daughter's December 2013 disappearance, was on trial for a kidnapping charge.
After four days of testimony and over seven hours of deliberations that were spread across two days, a mistrial was declared in Moorer's case.
The Fifteenth Circuit Solicitor confirmed the case against Moorer would be retried at a future date.