A case of murder was registered and four teams were formed to catch the accused.
A gym trainer was arrested for allegedly killing the owner of a medical store in southwest Delhi's Palam village after an argument over money, the police said on Thursday.
Neeraj Gupta, a resident of Dabri, who works at a gym in Chanakyapuri was arrested from the Pankha Road flyover in Bharampuri, Sagarpur, they said.
The incident took place on December 7 at a medical store near Mahaveer Enclave in Palam village, police said.
The injured, Sanjeev Kumar, was rushed to a private hospital before police reached the spot.
In his statement, Kumar had said that a customer came to his shop to buy medicines and an argument broke out between them over the amount, following which Gupta took out a pistol and shot him, said Deputy Commissioner of Police (Southwest) Devender Arya.
Kumar died on December 8, he said.
A case of murder was registered and four teams were formed to catch the accused, he added.
The accused was identified through CCTV camera footage, Mr Arya said.
"On Monday, at about 7 pm, police received a tip off, that Kumar is coming from Sadh Nagar. He was planning to leave Delhi and go to Raipur in Chhatishgarh at his in-laws place. A trap was laid and after a brief chase, the accused was nabbed from Pankha Road," the DCP said.
The pistol has been seized along with a motorcycle and 10 live cartridges, he said.
Investigation revealed that the accused had purchased medicines from the same store earlier and did not pay. On the day of incident, he again went to the store and an argument broke out over non-payment of the previously bought medicines, the police said.