"Since June, at least a dozen prisoners have died from reported cardiac arrest or heart failure in uncooled prisons on days when the regions’ outdoor heat indices were above 100 degrees, according to a Texas Tribune analysis of prison death reports and weather data. At least another 29 have died of what are still unknown causes pending autopsy results."

As the death toll in stifling Texas prisons climbs, congressional Democrats ask for investigation

https://www.texastribune.org/2023/08/21/texas-prison-heat-deaths/