Rene Castellani

In 1965, a radio personality in Vancouver named Rene Castellani committed to living on the top of the massive Bowmac car dealership sign until all the cars were sold. Later that same year, his wife Esther died and investigation revealed she had died a slow and painful death due to arsenic poisoning which had been administered to her over months. Forensic investigation revealed a stripe of hair growth that was arsenic-free, and it corresponded to the 9 days Rene was away, thus convicting him of her murder. He had been poisoning his wife with arsenic for months.