California's demand for notice of aggravating and for disclosure of evidence supporting mitigating circumstances is a legal procedure that requires the prosecution to provide the defense with information related to aggravating factors and evidence supporting mitigating circumstances in a criminal case. This demand is typically utilized in cases where the prosecution is seeking the death penalty, as it allows the defense to gather important information to build their case and protect the defendant's rights. The purpose of the California's demand for notice of aggravating and for disclosure of evidence supporting mitigating circumstances is to ensure a fair trial and enable the defense to adequately prepare for sentencing proceedings. By requiring the prosecution to disclose any aggravating factors they intend to rely on during sentencing, as well as any evidence supporting potential mitigating circumstances, the defense can effectively evaluate the case and develop a strategy to present a compelling argument for a lesser sentence. There are different types of California demands for notice of aggravating and for disclosure of evidence supporting mitigating circumstances, depending on the specific stage and requirements of the trial. One common example is the demand made during the pretrial phase, formally requesting the prosecution to disclose all aggravating factors and evidence supporting mitigating circumstances they possess. This type of demand provides an opportunity for the defense to review and analyze the information before trial. Another type of demand occurs during the penalty phase, when the defense may request an updated and more specific disclosure of aggravating factors and evidence supporting mitigating circumstances. This demand allows the defense to stay informed about any new developments and materials in the prosecution's possession. Keywords: California, demand, notice, aggravating factors, disclosure, evidence, supporting, mitigating circumstances, legal procedure, criminal case, death penalty, defense, fair trial, sentencing proceedings, pretrial phase, penalty phase.