San Francisco resident Lisa Heng, 30, is accused of fatally stabbing Matt Sheahan, a 40­-year-­old Marin County man. Courtesy photo

Jury to determine fate of SF woman who fatally stabbed boyfriend

A jury was scheduled to hear closing arguments in the trial Monday of a 30-year-old San Francisco woman who is alleged to have stabbed her lover in the heart during a methamphetamine-infused fight in a Tenderloin Hotel last year.

Lisa Heng, who is being represented by Public Defender Jeff Adachi, was arrested on the morning or July 18, 2014, after she called 9-1-1 and police found her and Matt Sheahan, her boyfriend, as the scene of the stabbing.

Adachi’s spirited defense painted Heng as an innocent girl whose meth-addicted boyfriend took advantage of her before she accidentally stabbed him.

“She acted because she was scared for her life, and he’d never been violent before,” Adachi said. “When she held the knife, she held it only to get him away.”

Alternately, the prosecution has characterized her as an irresponsible mother who was infatuated by her boyfriend and spent the little money she had on hotel rooms and methamphetamines.

Heng has admitted to stabbing Sheahan in the heart during an argument. He died later that same day from his wound, and she was arrested and subsequently charged with murder for the killing.

Heng took the stand during her trial, and questioning by Adachi attempted to portray an innocent woman who stabbed her boyfriend by accident after he beat and choked her.

But in cross examination, Assistant District Attorney Rebecca Wagner tried to draw out another version of the brief summer love affair between the pair. Part of that alternate narrative was Heng’s poor choice in Sheahan.

“She killed him because she was angry with him,” Wagner said in her opening statement. “She stabbed him to death.”

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