Police sources say the suspect is believed to be known to the 23-year-old techie and his call data records show he was in touch with her before she went missing on January 4.
Sources also said the detained suspect's phone could not be traced to Andhra Pradesh two days before the techie went missing while on her way to Mumbai after spending Christmas with her family in Hyderabad.
On Friday, the Railway Police recovered the CCTV footage where the young woman could be seen at the Kurla Railway Terminus the day she disappeared. The footage showed a man standing next to Ms Anuhya and is seen carrying her bag.
A team of railway police is in Andhra Pradesh to show the clipping to the young woman's parents in an effort to identify the man.
Sources say the police believe that the person who has been captured on CCTV could be an accomplice of the detained suspect.
The police have so far failed to recover key evidence like the Ms Anuhya's bag and laptop.
Her decomposed body was found 11 days after she went missing from the Kurla Railway Terminus. It was identified by her father, a retired Professor in the Andhra Pradesh University.