Ajay Kumar, in his mid-20s, was arrested Sunday, in Madhepura district for the Saturday killing in Champanagar village, said Superintendent of Police Saurabh Kumar.
The child's mother, who resisted Kumar's rape bid in her house, told police that the suspect attacked the minor due to his anger over the foiled sexual assault, he said.
Mumbai Roundup: 9 incidents that took place this week
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Photos: 'Dangal' girls Sanya Malhotra, Fatima Sana Shaikh's dinner outing