A 53-year-old businessman Wednesday shot his wife nine times, killing her on the spot, after she objected to his extramarital affair, police said.Deepak Khurana shot his 50-year-old wife Alka Khurana with his licensed pistol in their flat in Palam Vihar area here around noon."Khurana, who runs a furniture factory, had extramarital affairs. His wife Alka objected to his illicit relations. He shot her after a heated argument," police officer Moolchand told IANS.The couple's married son, who is a pilot, lives in Indonesia, while their daughter lives in Janakpuri area of Delhi with her family.Khurana was detained and a police case registered.