Final answer:
Ronda Randall helped with the Bear Brook murder investigation by analyzing DNA evidence and linking Terry Peder Rasmussen to the murders.
Step-by-step explanation:
Ronda Randall played a crucial role in the Bear Brook murder investigation as a forensic scientist. She analyzed the DNA evidence found at the crime scene and compared it to the DNA profiles of potential suspects. By identifying a familial match, she was able to link Terry Peder Rasmussen, also known as Robert Evans, to the murders. Ronda Randall's expertise and analysis played a significant role in solving the case and bringing justice to the victims.