I've conducted some basic research regarding criminology and the work of criminal psychologists. From what I've concluded, the focus of these studies are primarily related to determining why specific crimes are committed by individuals as well as identifying factors that are associated with crimes that have been committed or individual's actions, behavior, etc. related to a crime.
I'd like to understand if research has been conducted related to the childhood/early life experiences of individuals who have committed murder as an adult to determine which early life experiences they pinpoint as "turning points" which ultimately led them to intentionally kill another human being, etc.
To provide clarification regarding my motivation, I am specifically interested in identifying deficiencies in skills (e.g. anger management, self-control, emotional-regulation, etc.) in adolescents which contribute to life-altering anger-based decisions made by an individual when they are an adult.