WEST BLOOMFIELD TOWNSHIP, Mich. -

A 74-year-old grandmother was back in court Thursday on an open murder charge in her grandson's shooting death.

Sandra Layne is accused of shooting Jonathan Hoffman eight times on Friday at his grandmother's home in West Bloomfield Township. He called 911 to say he had been shot.

At the hearing before District Court Judge Kimberly Small, Layne waived her right to have a preliminary hearing within 14 days of her arraignment.

As Layne entered the courtroom, some of her children and grandchildren waved to her. Hoffman’s parents were sitting on the opposite side of the courtroom and didn’t have any interaction with them.

UNCUT VIDEO: Grandmother's court hearing May 24, 2012

SLIDESHOW: Inside courtroom for grandmother's hearing May 24, 2012

The prosecution asked that they be allowed to file a motion that Layne be tested for competency.

“A defendant is presumed to be competent unless there is a showing of incompetency," Small said. But she granted the prosecution two weeks to file the motion.

Layne's defense attorney, Jerome Sabbota, disagreed with the prosecution's request, saying he didn't understand their basis for wanting it.

“She knows who I am, she knows what she’s charged with, she knows what the proceedings are, she knows who you are," Sabbota said.

Small said the defense would be given time to respond to the prosecution's competency hearing before she ruled on it.

Layne remains in the Oakland County Jail without bail.

Her next court date was set for July 2.

grandma in court may 24 2012

New revelations on motive

Sabbota said Layne has told him Hoffman threatened her just moments before the shooting occurred.

“I believe there was a threat, sure,” Sabbota said.

When asked what type of threat, Sabbota said he believed it was both physical and verbal.

Sabbota said Hoffman wasn’t armed with a weapon.

“Does a 17-year-old need to be armed against a 74-year-old?” Sabbota said.

Sabbota said his client had told him that Hoffman made comments that lead her to believe her life was in danger.

"She doesn't want to portray her daughter as a bad mother. But the circumstances ended up that she was the caretaker of this child. Dynamically, this happened as a result of his problems," Sabbota said.

Attorney: Grandmother was caring for troubled teen

Uncut: Grandmother charged with open murder

Hoffman had been living with his grandparents so he could stay in Farmington schools while his divorced parents settled in Arizona, said his father, Michael Hoffman, of Scottsdale, Ariz.