Pradeep, a 19-year-old "illiterate" who works as a mason in Delhi, was arrested from his maternal uncle's house here in the wee hours today.
According to his friend Manoj, who was arrested two days ago, they had consumed alcohol at his house in east Delhi's Gandhi Nagar on April 15.
Manoj claimed that Pradeep had insisted on bringing a girl to the house and he went out and lured the five-year-old girl living in the same building with a chocolate, police said in Delhi.
The duo left her thinking she was dead, police said.