University of Utah Health Care spokeswoman Kathy Wilets says in a statement that two technicians in early April had switched shifts. The technician who was supposed to show up at the prison forgot about the switch and missed two days of appointments.
Wilets says their records show a prison nurse called the dialysis clinic on the third day, but the clinic was closed because it was a Sunday.
Inmate Ramon C. Estrada died that night from complications of kidney failure. Estrada was 62 and was set to be paroled less than three weeks later.
Utah Department of Corrections spokeswoman Brooke Adams says the prison is still investigating.