Life or death: A qualitative examination of mitigating and aggravating evidence presented in capital trials

The US Supreme Court has required that death penalty procedures narrow the class of persons eligible for a death sentence. Through the selection requirement, juries must use mitigating and aggravating evidence jointly to determine if a defendant is one of the worst of the worst, resulting in a sentence of life without parole or death. This study analyzed capital trial transcripts from the punishment phase to assess the type and amount of mitigating and aggravating evidence presented to jurors in cases resulting in life without parole and death. The main assumption of the research was that cases resulting in life without the possibility of parole (LWOP) would reveal patterns in the types of evidence presented and differing patterns in cases where the jury handed down a sentence of death. The study qualitatively examined the trial transcripts from the punishment phase of 18 capital murders (nine resulting in LWOP and nine in death). The extra-legal factors from each LWOP case were matched to a death case to eliminate sentencing discrepancies based on jurisdiction, race of defendant or victim, aggravator, age etc. The results found no consistent patterns of evidence presented in cases resulting life without parole and some relevant patterns in sentences resulting in death.