I Think My Brother's Best Friend Died Because The Landlord Shut The Power Off During An Ice Storm. What Can I Do?

My brother found his best friend, in a cold house with no power. He called the police and an autopsy is being conducted, the neighbors told the police they saw her (the landlord) snooping around the house, and she had previously shut the power off. She rented the house out after it had been in foreclosure for a few months and couldn't get a legal eviction because she hadn't legally rented it or secured a contract. When the house sold at auction, she threatened my brother and his friend and my brother moved out. His best friend was trying to find somewhere to live on short notice. I feel like throwing up.