Modifies provisions relating to trial procedures for murder in the first degree

HB 2141 changes the trial process for first-degree murder cases involving the death penalty. It requires a two-stage trial: first, a jury decides guilt (without considering punishment), and only if guilty, a second stage determines punishment. If the death penalty isn't waived, the jury must impose life imprisonment without parole if they find the defendant intellectually disabled, no aggravating circumstances exist, or they cannot agree on the death penalty. The bill defines "intellectual disability" as substantial limitations in intellectual functioning and adaptive skills present before age 18, and applies only to offenses committed on or after August 28, 2001.