Pradeep Ram was arrested by a joint team of Delhi and Bihar police from his maternal uncle's house in Lakhisarai area in Bihar in the wee hours Monday.
"I have committed a big mistake", Pradeep told police when he was arrested, a Delhi Police officer told IANS.
Pradeep, a labourer, was being brought to Delhi in a chartered flight by Delhi Police at night.
An illiterate, Pradeep belongs to Ahiyapur in Sheikhupura district of Bihar. He befriended Manoj Kumar, the main accused, on a train while both were on way to Bihar from Delhi earlier this year.
Manoj Kumar, 22, was arrested Friday from his in-laws house in Bihar's Muzaffarpur area.
