Only a quarter of Texas prisons have air conditioning, here's what that means for prisoners

Michele Deitch, a criminal justice professor at the University of Texas Law School, said the temperatures inside these prisons can reach triple digits during the summer months and put inmates like Hernandez at risk of a stroke and other heat-related illnesses.

"The temperatures can exceed anything that any of us on the outside have ever experienced," she said. "We're routinely in excess of 110, 120, 130 degrees, and metal furniture becomes too hot to touch."