A California jury ordered chemical giant Monsanto to pay nearly $290 million Friday for failing to warn a dying groundskeeper that its weed killer Roundup might cause cancer.

Jurors unanimously found that Monsanto — which vowed to appeal — acted with “malice” and that its weed killers Roundup and the professional grade version RangerPro contributed “substantially” to Dewayne Johnson’s terminal illness.

Following eight weeks of trial proceedings, the San Francisco jury ordered Monsanto to pay $250 million in punitive damages along with compensatory damages and other costs, bringing the total figure to nearly $290 million.

Johnson, a California groundskeeper diagnosed in 2014 with non-Hodgkin’s lymphoma — a cancer that affects white blood cells — says he repeatedly used a professional form of Roundup while working at a school in Benicia, California.

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