“Heat illness continues to be extremely significant for us, and we put special emphasis on it,” said Erika Monterroza, a state occupational safety spokeswoman.
Four people whose deaths are under investigation were farmworkers, and one was a construction worker.
Schwarzenegger issued a statement Friday to “remind outdoor workers and those that employ them of California’s stringent regulations to prevent heat illness.”
On Wednesday, Rodolfo Ceballos Carrillo, 54, collapsed while loading boxes of table grapes onto trucks at Sunview Vineyards in Kern County.
Autopsy results are pending. Temperatures reached 97 degrees. In July 2008, Abdon Felix, 42, another worker for Sunview Vineyards, died after performing the same job.
Read more here: Possible link to heat exposure investigated in 5 California worker deaths