Buffalo, NY (WBEN) The only defense witness took the stand in the Candace Cartagena trial today. Doctor Jonathan Arden testified Cartagena's daughter Bianca died of an abnormality in her heart. Arden said he does not believe the little girl died of asphyxiation, saying Bianca did not have something placed over her nose and mouth. Arden says instead she was laying face down and resting on a pillow. Candace Cartagena is charged with smothering the little girl.