Brittany Norwood's lawyers will not be using an insanity defense, sources said Monday.

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Her attorneys had a deadline of close of business today to inform a judge if they planned to claim Norwood was "not criminally responsible" for the March murder of Jayna Murray, her co-worker at the Bethesda Lululemon store.

According to a source close to the defense team, no papers will be filed with the judge today.

Norwood has previously entered a not guilty plea.

The trial on first degree murder charges is scheduled for October.

The murder of Murray sent shockwaves throughout the nation because of the brutality of the slaying and the twists and turns the case took. When Norwood and Murray were discovered, Norwood told authorities she and the victim had been sexually assaulted by unknown assailants, police said.

Authorities later announced that Norwood concocted the story and was responsible for beating Murray to death.

The struggle between the two women may have lasted more than 20 minutes and the blows to Murray's head were too numerous to count. Her skull was fractured and spinal cord severed by a wound that extended through her neck.

Authorities said that on the day of the slaying, at her manager’s request, Murray looked in Norwood’s personal bag and found stolen merchandise.