HOUSTON -

A man has been charged, accused of helping his wife commit suicide.

Sonia Dixon was found dead in the bedroom of her apartment on Friday. She apparently died of helium asphyxiation. It's a common, painless method of death used in assisted suicides.

According to court records, Dixon was found with a plastic bag over her head. It was connected to helium bottles by two plastic tubes. That's all common components of what's known as a "suicide kit."

Dixon's husband, Mark Kelly, allegedly told investigators that he helped his wife buy the helium and then connected the tubes and hood for her.

Investigators said Dixon insisted Kelly leave their apartment Friday, so he spent the night at a motel.

Prosecutors said there were several suicide notes scattered around the apartment. The couple said they were in financial trouble.

A friend said Kelly made a good living as a truck driver up until about 15 months ago, when he lost his job. Since then, he earned substantially less working at a fast-food restaurant. In the weeks leading up to Dixon's death, Kelly allegedly worried that he wouldn't be able to pay next month's rent.

Kelly has been charged with aiding suicide, a state jail felony. If he's convicted, he would face up to two years behind bars.

Kelly is being held in the Harris County Jail with bond set at $2,000.