Matthew Archuleta, who was born in 1988, was found unresponsive and later pronounced dead.
He had been booked into jail by Albuquerque police on June 19 on vehicle theft, eluding police, and other charges.
“Both internal and external investigations are being conducted at this time,” jail spokeswoman Nataura Powdrell-Moore said.
She said that Archuleta had been taken to the University of New Mexico Hospital earlier in the week after “faking a seizure” at a courthouse.
As he was in the Emergency Room, he asked to use the restroom, and as he walked out of the restroom, “he attempted to overpower” and run away from the female corrections officer who was assigned to watch him, Powdrell-Moore said.
“He was immediately taken down…and restrained” she said, describing the incident in an email. “He never made it outside of the building or out of reach of the (corrections officers) and UNMH security.”