By Melissa Newton, CBS 11 News

DENTON (CBSDFW.COM) – The trial of a Sanger man who was charged with killing his estranged wife five years after she vanished began Monday at the Denton County Courthouse.

Kathy Stobaugh was last seen Dec. 28, 2004 after she went alone to visit her estranged husband Charles Stobaugh at his Sanger home. Her body was never found.

Five years after the disappearance, Charles Stobaugh was arrested and charged with her murder. He’s been held in lieu of a $100,000 bond in the Denton County Jail.

“It’s been frustrating,” said the victim’s brother, Chris Munday. “It’s like our life stopped to a certain point but the world around us kept going.”

The jury will have to decide beyond a reasonable doubt whether Stobaugh committed murder, even with the absence of a body. Munday said he knows in his heart that his sister is no longer alive.

“I’m a religious man,” he said, “And I know where she’s at.”

Charles and Kathy Stobaugh were going through a divorce when she went missing. On the day the 43-year-old mother of two vanished, Munday said she was visiting her estranged husband.

“Supposedly Charles called her out to his property alone, which none of us wanted her to do,” he said. “And that was the last anyone ever saw of her.”

Her car was found in Charles Stobaugh’s driveway with the keys still inside. But even after an extensive search, her body was never found.

“It would be nice to find her body,” Munday said. “We have a headstone, a grave right beside my mother’s. It would be nice to put her in her place where she belongs; a proper burial.”

Stobaugh has never publicly discussed his wife’s disappearance and did not want to comment outside the courtroom Monday.

The trial is expected to last about two weeks.

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