(WBIR-Sevierville) Sunday marked the five year anniversary of a Sevier County woman's death and five years of an unsolved murder.

Investigators first thought Shannon Hercutt died in a car accident. An autopsy later revealed she was murdered at home, put in her SUV, then sent down a steep drop in the Fox Run Resort area.

"I knew she was murdered. Don't ask me why, I just felt that way," said Penny Lane Stephens, Shannon's older sister.

Stephens met with 10News on the five year anniversary of Hercutt's death to ask for the public's help, once again.

"It kills me every day. A little bit of me dies because I feel like I'm letting my sister down for not having justice," she said.

Stephens visited her sister's grave on Sunday saying, "It never gets better. It just gets harder."

According to Stephens, there is a $40,000 reward for information leading to an arrest and conviction of the person or persons responsible for her death.; $25,000 comes from the state of Tennessee. But Stephens said she rarely hears from the Sevier County Sheriff's Office, who is investigating the case.

"It makes me wonder if my sister's case is sitting on a shelf, getting colder as we speak," she said.

She went on to say, "It hurts that someone could take Shannon away from us and to know they're still out there and they know what they did."

10News spoke to the Sevier County Sheriff's Office and the Tennessee Bureau of Investigation (TBI). Both would not comment on the case but told 10News "the case has remained open for the duration since her death and many leads have been investigated since that time."

Anyone with any information about the case should call Sevier County Sheriff's Office Criminal Investigation Division at 865-428-1899 or TBI at 1-800-TBI-FIND.