Houston-based oncologist Ana Maria Gonzalez-Angulo was charged this week of poisoning her lover by putting a chemical commonly found in antifreeze in his coffee.

Her boyfriend is Dr. George Blumenschein, a fellow cancer specialist who works with Gonzales-Angulo at the M.D. Anderson Cancer Center. He told police that she tried to poison him on the night of Jan. 27, several hours before he checked himself into the hospital suffering from kidney failure.

A criminal complaint obtained by The Houston Chronicle alleges that she slipped the odorless, colorless chemical into his coffee, and when he noticed that it tasted a little sweeter than normal, she urged him to drink up and explained she'd added Splenda sweetener. Then Gonzalez-Angulo allegedly served him a second cup of the laced beverage.

Urine testing later showed Blumenschein was under the effects of ethylene glycol poisoning. Ethylene glycol, a key ingredient in antifreeze, is also used in medical research and would have been present in the labs where both doctors work.

Gonzalez-Angulo denied the allegations through her attorney and is currently free on $50,000 bail.

This video is from CBS Dallas, aired Sunday, June 9, 2013.