Like all mental illnesses, bipolar can be difficult to live with.
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Joe Mendoza says Marquez was having a seizure when South Pasadena officers arrived, and paramedics treated her.
It is true that many people who suffer from bipolar self-medicate; impatient with prescription drugs, they might use drugs that have a more pronounced effect, such as meth or cocaine.
The Los Angeles Sheriff's Department said Friday that 49-year-old Vanessa Marquez died at a hospital following the shooting at her South Pasadena apartment Thursday.
This was offered as a counter-explanation to her shocking behavior.