In 2008, Pournelle battled a brain tumor, which appeared to respond favorably to radiation treatment. An August 28, 2008 report on his weblog claimed he was now cancer-free. Pournelle suffered a stroke on December 16, 2014, for which he was hospitalized for a time. By June 2015, he was writing again, though impairment from the stroke had slowed his typing. Pournelle died in his sleep at his home in Studio City, California, on September 8, 2017.