A Colorado dentist accused of fatally poisoning his wife in a “complex and calculated murder” was arrested over the weekend, officials announced. ” She was placed on a ventilator in the ICU and “she was declared medically brain dead a short time later,” authorities said. “When the suspicious details of this case came to light, our team of officers and homicide detectives tirelessly worked to uncover the truth behind the victim’s sudden illness and death,” Investigations Division Chief Mark Hildebrand said