HOUSTON, Texas (CNN) — The attorney representing a woman standing trial on murder charges for running him over repeatedly in her Mercedes-Benz collapsed during a court break Wednesday and was taken to a hospital.

Clara Harris, 45, spent about an hour testifying for the first time in her own behalf before court broke for lunch. Her attorney, George Parnham, collapsed a short time later, was put on oxygen but was alert and talking before leaving for the hospital.

His co-counsel, Dee McWilliams, said Parnham has high blood pressure and has been feeling under the weather lately but seemed fine Wednesday.

Clara Harris is accused of running over her husband David, an orthodontist, three times in her $70,000 automobile last July 24 in a hotel parking lot after allegedly catching him at the hotel with a receptionist.

Defense attorney George Parnham has said it was an accident when Clara Harris fatally injured her husband. If she is convicted, her lawyers are prepared to lodge a "sudden passion" argument that could result in a sentence far lower than the life maximum under Texas law.

Prosecutors say Harris meant to kill her husband. Officials with the medical examiner's office concluded Harris was run over at least twice. The receptionist, Gail Thompson Bridges, a divorced mother of three, testified Tuesday.

Fighting back tears, Bridges testified she believed the marriage was "open" to other sexual partners. Bridges, who acknowledged having an affair with David Harris beginning last May, said she assumed Clara Harris knew about the sexual trysts because of her boss' statements.

But asked by a defense attorney if she blamed Clara Harris for being angry, she said: "No ma'am, I do not." She said she was surprised by the reaction because she thought the affair was within the bounds of the Harris marriage.

Bridges took jurors through the time she was hired at David Harris' orthodontic practice in August 2001, to a blossoming romance last April and finally a sexual rendezvous.

She said her paycheck grew as her relationship with David Harris grew closer.

"You didn't consider your dates with David overtime, did you?" defense attorney Emily Munoz asked.

"No," Bridges responded.

David Harris admitted to the affair on July 17. A week later, Clara Harris tracked down her husband and Bridges at the hotel.

Clara Harris and Bridges tussled in the lobby, and then Bridges returned to her sport-utility vehicle in the parking lot, she said. She was standing inside her driver's side door when she said she saw Clara Harris churning through the parking lot in the Mercedes.

Bridges said she did not see David Harris struck by his wife's car.