An Act amending Title 42 (Judiciary and Judicial Procedure) of the Pennsylvania Consolidated Statutes, in sentencing, further providing for sentencing procedure for murder of the first degree.

HB 166 amends Pennsylvania's sentencing rules for first-degree murder cases by changing jury instructions. It requires juries to unanimously find either: (1) at least one aggravating circumstance with no mitigating circumstances, or (2) that aggravating circumstances outweigh mitigating circumstances beyond a reasonable doubt, to impose the death penalty. If these conditions aren't met, the sentence must be life imprisonment. The bill directly affects defendants convicted of first-degree murder in Pennsylvania courts and modifies the procedural steps for jury sentencing decisions under Title 42. This is a procedural change to existing sentencing law, not a policy shift altering what constitutes murder or aggravating factors.