Takahiro Shiraishi lured victims that contemplated suicide on the social media network and was arrested after body parts were found in his flat in 2017.
Five deaths in the last month have sparked fears of "serial killings" targeting suspected sex workers and protests by women activists in the city of Port Harcourt.
In order to show off his skills in bringing patients back from the brink of death, Niels Hoegel repeatedly injected people under his care with lethal medication. His colleagues mostly claim ignorance about his actions.
The man, who authorities say is among the worst serial killers and rapists in US history, is a 72-year-old Vietnam War veteran, former police officer and grandfather.
Accused grocer confesses to killing 11 women nearly three decades after he allegedly committed the first murder. A relative's DNA test in a separate case reopened the investigation into the serial killings.
A jury has recommended the death penalty for the killer who hunted unsuspecting poor women in the back alleys of South Los Angeles for years.
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