BERKELEY, Calif. — A woman who was secretly poisoned by her co-worker at a Berkeley, California, engineering firm nearly 10 years ago is now sharing the hidden-camera video that helped catch him.
It comes as the man, identified as David Xu, who has been convicted of poisoning her, is set to appear in court Monday. He will ask an Alameda County judge to dismiss his felony conviction. Also known as an expungement.
He could have faced life in prison, but instead took a plea deal that landed him probation.
Xu was a chemical engineer at Berkeley Engineering and Research.
RELATED: Berkeley chemical engineer held without bail, charged with trying to poison co-worker
The video, shared with our sister station KGO-TV on Saturday, shows him tampering with her water bottle.
The Berkeley Police Department says he poisoned her with cadmium, a toxic heavy metal.
RELATED: Berkeley chemical engineer charged with trying to poison co-worker to death
The poisoning nearly killed the woman.
Our media partner, The San Francisco Standard, reports the bottle contained cadmium levels, three-and-a-half-million times the federal drinking water limit.
Copyright © 2026 KGO-TV. All Rights Reserved.