He told detectives Friday he planned both attacks and “did not feel bad about it.”
Prison officials did not list the cause or manner of death. He was 86.
The shooting left Michael Dunbar, 28, and Teray Lyles, 29, dead.
In a highly unusual move, at the request of prosecutors, a judge on Thursday tossed out the guilty plea of a man who a month ago admitted to the rape and murder of a 15-year-old Arbor View High School freshman.
North Las Vegas police investigating an apparent homicide Friday afternoon.
A man has been arrested after an attack that left one man dead and another injured, Friday morning in North Las Vegas, according to North Las Vegas police.