Sunanda Pushkar's son Shiv Menon Thursday joined the probe in connection with her murder, police said.
Menon reached the Vasant Vihar police station, also the office of the Special Investigation Team (SIT), around 1.15 p.m.
Earlier, Menon interacted with SIT members, who have asked him to join the probe.
Police Commissioner B.S. Bassi Wednesday said that Menon has reached Delhi from Dubai and has been asked to join the probe as soon as possible.
Sunanda Pushkar was found dead in a luxury hotel room here Jan 17, 2014. A murder case was registered against unknown people Jan 1 2015.
