One rationale used in the imposition of capital punishment is the potential future dangerousness of the most serious offenders. Most research in this area has focused on the postcommutation and postrelease behavior of formerly condemned offenders and found that the majority of them did not pose significant danger risks. The current study examined the prison infraction records of 1,005 Arizona inmates serving determinate, life, or death sentences. Zero-inflated negative binomial regression models indicated that inmates sentenced to death were more dangerous than noncondemned inmates were. This effect achieved modest statistical significance and withstood controls for demographic characteristics, offense severity and type, criminal history, and diagnostic measures. Overall, these findings suggest that condemned defendants may be more dangerous than others, a statement sharply discordant with the extant literature regarding the future dangerousness of capital defendants. Additional research employing different samples from different regions of the United States is needed.