The Murdaugh family’s longtime housekeeper, Blanca Turrubiate-Simpson, said a white pickup truck still "haunts" her years after the brutal Lowcountry murders of Maggie and Paul Murdaugh.

Her book, "Within the House of Murdaugh: Amid a Unique Friendship," co-authored with Mary Frances Weaver, chronicles not only her close relationship with Maggie Murdaugh but also the details surrounding the night Maggie and her son Paul were killed.

In an interview with Fox News Digital, Turrubiate-Simpson discussed the moment that still troubles her more than four years later, including a white pickup truck she saw near the family’s property off Moselle Road in Colleton County, South Carolina. The property was known simply as "Moselle."

"The part that really haunts me," she said, "was not looking into that white truck that was parked out there by the hangar."

She recalled that she initially assumed it belonged to Paul and felt no reason to check it.

"When I heard testimony during the trial where they specified that Paul’s phone was dinging in Okatie, I said, well, who was driving that truck? Who was driving the white truck? The white F-150? That’s one of the main ones that bothers me."

Turrubiate-Simpson said she has often replayed that moment in her mind, wondering why she felt compelled to leave the property through a different gate rather than drive past the kennels.

In her book, Turrubiate-Simpson floats a theory where she believes Alex may not have acted alone that night, not in the murders themselves, but in the aftermath.

"My theory in the book is that he had help to clean, possibly setting up," she told Fox News Digital.

The distance between the main house and the kennels, she said, plays a critical role.

"It takes a good few minutes to get back and forth. In the time that they said it was done, there’s just not enough time."

Turrubiate-Simpson said her theories are rooted in her intimate knowledge of the family’s routines, noting that "there’s no evidence" that she’s aware of suggesting that Alex had help.

In her memoir, Turrubiate-Simpson said that her purpose was not to fuel speculation, but to remind the world of Paul and Maggie’s lives.

"I wrote this book because of Paul and Maggie," she said. "I don’t want her forgotten. When they hear his name, I’m tired of hearing just his name. The two victims have been forgotten in all of this."

The South Carolina Supreme Court is scheduled to hear Murdaugh’s appeal on Feb. 11.

Murdaugh’s team requested a new trial, arguing he did not receive a fair trial because of alleged jury tampering by Colleton County Court Clerk Becky Hill.

"I think we all deserve a fair trial," Turrubiate-Simpson said. "If they determine that he did not receive one, then we just must follow through. It’s the law."

Turrubiate-Simpson said she doesn’t plan to watch Hulu’s recent dramatization of the Murdaugh saga.

"I’ve watched some documentaries," she said. "But I don’t feel the need to watch the Hulu series because I lived it. There’s no point in watching something that I already lived."