Umakant Pandit, who owns a factory, was apprehended from Rohini Sector II for murdering Rachna with whom he had an extramarital affair, P Karunakaran, Additional Deputy Commissioner of Police (Outer), said.
He landed in police net when he came there to wash off the blood stains in the house where Rachna was strangled allegedly by him.
Pandit, who is married and has two children, had taken a house on rent in Rohini Sector 21 for Rachna.
He was fed up with the demands of Rachna and allegedly decided to murder her. He even bought a car to allegedly dispose of her body after murdering her.
"He strangled her yesterday morning. He has purchased a red color suitcase already for disposal of the body. During the day time, he wandered here and there and also visited several times but could not get a chance to dispose off the body," the official said.