Jimenez's family told La Vos de Asturias that he suffers from epilepsy. They believe that, being jailed, he may not have been able to take his medication properly.
It is unclear if his epilepsy contributed to the episode.
Live Science reported that some people with epilepsy can suffer episodes of catalepsy, described as a trancelike state in which they become unresponsive to stimuli and their muscles become rigid. That rigidity may have been taken to be rigor mortis in Jimenez's case.
Catalepsy can also result in a slowing down of vital signs until they’re nearly imperceptible.
La Voz de Asturias reported that the first thing Jimenez did upon regaining consciousness was to ask for his wife. Doctors at the hospital told his family that his ability to talk and remember his past are good signs, but it is too early to determine if a lack of oxygen will result in permanent problems.
Prison officials are investigating how all three doctors who examined Jimenez found no signs of life.