Killings by juvenile homicide offenders (JHOs) who use accomplices have been increasing since the 1980s and currently represent approximately half of juvenile arrests for murder in the United States. Nevertheless, prior research has not compared JHOs who kill alone with JHOs who kill in groups. The present research followed up 30years later on a sample of 59 male murderers and attempted murderers sentenced to adult prison. This study was designed to analyze whether lone and group JHOs differed on pre-incarceration, incarceration, and post-incarceration variables. Significant findings indicated that compared with lone offenders, group JHOs had a higher mean of pre-homicide arrests and were more likely to be Black, have a pre-homicide delinquent record, commit a crime-related homicide offense, and target a stranger. With respect to post-homicide variables, group JHOs were more likely to be released from prison and more likely to be rearrested. The two types of JHOs did not differ significantly in relation to the number of post-release violent offenses. Preliminary implications of the findings and avenues for future investigation are discussed. Copyright (C) 2016 John Wiley & Sons, Ltd.
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机译：自1980年代以来，使用共犯的未成年人杀人罪（JHOs）的杀人人数一直在增加，目前约占美国因谋杀而被捕的少年的一半。然而，先前的研究并未将单独杀害的JHO与成群杀害的JHO进行比较。 30年后，本研究对59名男性凶手和未遂凶手进行了抽样调查，并判处其成年徒刑。本研究旨在分析单独的和集体的JHO在嵌顿前，嵌顿和嵌顿后变量方面是否有所不同。重要发现表明，与单独犯罪者相比，JHO组的凶杀前平均逮捕率更高，更有可能是黑人，凶杀前犯罪记录是犯罪的，犯下了与犯罪有关的凶杀罪，并瞄准了一个陌生人。关于凶杀后的变量，团体JHOs更有可能从监狱中释放出来，并且更有可能再次被捕。两种类型的JHO在释放后的暴力犯罪数量上没有显着差异。讨论了研究结果和途径对未来调查的初步含义。版权所有（C）2016 John Wiley＆Sons，Ltd.
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