A breast cancer physician charged with spiking her lover's coffee with a compound used in antifreeze was obsessed with the man and even had a private investigator follow him, prosecutors said in opening statements at her trial.

Ana Maria Gonzalez-Angulo, 43, is charged with aggravated assault of a family member, which also covers domestic violence in dating relationships, for allegedly spiking George Blumenschein's coffee in January 2013.

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