The accused, Mantram alias Mantra, a resident of Harkauli in Uttar Pradesh, was arrested yesterday from Govindpuri area, police said.
After the incident, he had changed his job and had even shaved off his beard so that he couldn't be caught, said a senior police officer.
The accused was working at a 'Paratha Point' in Nehru Place and was not been seen after Holi.
Mantram is married with four kids and his family lives in Uttar Pradesh while he has been working here for the last 15 years.
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"He then took her to an unknown place on a white colour vehicle and sexually assaulted her. The girl said the person's name was Mantra, " said the officer.
On the day of the crime, Mantram had picked up the girl from Govindpuri and taken her to Nehru Place and then dropped her back to the place where she stays.
"He knew if he left the girl at Nehru Place, he would be caught. He dropped her at Govindpuri so that she wouldn't remember the place where he had sexually assaulted her," said another officer.
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