What is co-defendant witness?

A co-defendant witness is an individual who is a co-defendant in a legal case and provides testimony or evidence that may be favorable to another party, often the prosecution. This witness may testify against their own interests or those of their co-defendants, typically as part of a plea deal or agreement to reduce their own charges. Their testimony can be crucial in cases involving multiple defendants, as it can help establish facts or provide insights into the criminal activities being investigated.