The six-year-old boy from northern China was drugged and had his eyes gauged out. PHOTO: AFP/FILE
DNA tests found the boy's blood on the aunt's clothes, Xinhua reported, citing a statement from police in Linfen in rural Shanxi province.
The aunt, Zhang Huiying, killed herself six days after the attack by jumping into a well, the agency said.
The boy was lured by a woman with yellow-dyed hair into a field while he was playing outside. She gouged out his eyes and left him in a pool of blood, Xinhua reported.
Chinese media reports last week linked the crime to China's burgeoning black market for organs, as police had initially said the boy's corneas were missing.
But police later reported that the corneas were not missing.
Photographs and videos of the boy have circulated widely online since the attack, the most searched term on China's Twitter like 'Sina Weibo microblog' service on Wednesday, with internet users trying to understand what many saw as an incomprehensible act of violence.
"Now it turns out the person who destroyed this child's whole life may be a close relative," wrote one user. "It's hard not to feel helpless and bitterly disappointed... how painful."
State media has previously reported on organised gangs that abduct and maim children from the countryside so they can work as beggars, but there was no evidence that that was the motive in this attack.
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