The deaths highlight weaknesses in the elderly care system in the country, whose vast population is ageing rapidly.
He Tiandi, 45, went on trial last week in the southern city of Guangzhou for the murder of a woman in her 70s.
According to local media reports, the victim's daughter-in-law had promised He a full month's wage in the event of her patient's death regardless of how many days she had worked.
"I didn't want someone else to get the money," she told the court, the paper reported.
During a police interrogation, He confessed to murdering another seven patients and attempting to kill two more by poisoning, the article said, adding that prosecutors did not press charges over these cases due to a lack of evidence.
There are deep demographic challenges in China, where holes in the social safety net have left many of the country's aged, and their children, desperate for assistance.
"An increasing number of them will need the care of others in the near future," the China Daily said in an editorial about the murder case today.
While children "can put safety measures in place against those with bad or evil intentions... It should be possible for such care providers to be registered and vetted", it added.
The worries were reflected on social media.
"This is hard to bear," said one commentator. "The living environment of the elderly is bleak.
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