Aurora, Colorado - A Colorado dentist has been arrested for the murder of his wife.

Investigators say James Craig poisoned her and they are calling it a "heinous" and "calculated" murder.

Arapahoe county's newest inmate is James Toliver Craig, a 45-year-old man accused of poisoning and killing his wife.

Some in Aurora may know him as their dentist at Summerbrook Dental Group near Chambers Road and Hampden. The office is on the third floor of this building. Dr. Craig's bio on their website says he and his wife are proud parents of six kids. Patients of his for over a decade have been posting online, sharing how shocked they are.

Homicide detectives arrested him on Sunday morning, but days before police say he drove his wife to the hospital. It was last Wednesday and she complained of severe "headaches and dizziness" Aurora police say her health deteriorated quickly, and she was placed on a ventilator. She was taken off life support.

Investigators found the details of the case to be "suspicious". They discovered this was in fact a quote "heinous, complex, and calculated murder."