An Arapahoe County jury has returned a guilty verdict for first-degree murder in the trial of James Craig, the Colorado dentist accused of poisoning and killing his wife with poison.

A Colorado dentist was sentenced to life in prison Wednesday after being convicted of killing his wife by lacing her protein shakes with poison before delivering a fatal dose of cyanide when she was in the hospital.

Prosecutors claimed James Craig purchased arsenic and cyanide and secretly dosed his wife using protein shakes.