Her sister has spoken out for the first time, telling 9News the allegations are not in line with her character.

Police claim the footage of a woman on a morning walk with her dog’s leash in one hand and what looks like a jerrycan in the other is Chesser.

About three hours later police say they uncovered her alleged sinister crimes.

Watching from Queensland, her distraught family were shocked to learn of the allegations against Chesser.

The former Beauty and the Geek contestant is accused of burning Julian Story’s remains inside their unit in Port Lincoln, South Australia, two days after reportedly taking his life and dismembering him.

Her sister said in the months before she had concerns for Chesser’s mental health.

“It’s my sister but that’s not who she is or the Tamika we know. That’s not the Tamika anyone knows,” she said.

“It just started getting worse you know and she started being in and out of mental health.

“She seemed, like I don’t know, I guess OK. She didn’t mention anything and she just told everyone she loves them.”

Chesser remains in police custody at a mental health facility in Adelaide.

Her family is restricted from talking with her.

“She’s still unresponsive at the moment,” her sister said.

Police still haven’t been able to formally interview the 34-year-old as they continue their search for Julian’s missing remains in Port Lincoln.

Story’s body was found without his head after police responded to a small fire in the yard of the house about 3.35pm on June 19.

Chesser, 34, has been charged with murder.

Today police divers sifted through the shallows along the foreshore in a grim search for Julian’s head.

Although an intensive search has been conducted, Story’s remains remain undiscovered, but investigators are committed to providing his family with closure.