May 16, 2009 3:47:25 AM PDT
The son of the founder of the national retailer has been arraigned in a Long Island hospital on charges of murdering his mother, who was beaten to death at their home. [SIGN UP: Get headlines and breaking news sent to you]

Eduardo Barragan's lawyer has entered a not guilty plea for him. Lawyer Andrew Monteleone says his 39-year-old client has heart palpitations and was "incoherent" at Friday's arraignment.

Police say Barragan beat 65-year-old Kay Barragan on Tuesday after an argument at their home in Searingtown, just east of New York City.

Barragan is having a psychiatric exam to see if he's fit for trial.

His Ecuadorean mother was credited with lending $2,000 to her husband to start the company that became 1-800-Mattres, famous for its slogan "leave off the last S for savings."

The Queens company was renamed to reflect online growth.

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