The accused, who hails from Dhanbad in Jharkhand, was living in Dadra and Nagar Haveli for the last four years, working in different factories.
Delkar, the 58-year-old independent MP from the Union Territory, was found hanging from a ceiling fan in his hotel room in south Mumbai on February 22.
The Opposition party claimed the seven-time MP had named the administrator, Praful Khoda Patel, and other officials of the union territory in his purported suicide note.
The body of 58-year-old Delkar was found in a hotel in South Mumbai and has been sent for a postmortem.
His body has been sent for postmortem. Further investigation is underway.