The police have detained a man for killing an elderly couple in Niti Bagh area of south Delhi a couple of days ago. Police said three men committed the murder, including Mukesh Yadav — the newly hired domestic help of the victims –– Ashok Goel and Lata Goel. Police have detained the man, a native of Bihar, for conniving Yadav and his uncle. The suspect, who works for Lata Goel’s sister, was picked up for interrogation on the day of the murder. He confessed to the crime on Wednesday. The other two accused are hiding in Bihar with the booty and teams have been camping there to arrest them, police said.