The incident took place yesterday when the deceased, identified as Prashant Chauhan, had gone to his uncle's house in Sarita Vihar, they said.
At the house, Chauhan's cousin, a minor, who is said to be a student of Class 11, managed to procure his father's pistol which was kept at his house, police said.
Chauhan, a native of Pali village in Uttar Pradesh, was admitted to a hospital with a gunshot injury where he was declared brought dead, they said.
He was working as a teacher on a contract basis in Shahdara, they said.
Deputy Commissioner of Police (South East) Chinmoy Biswal stated that after an inquiry it was revealed that Chauhan was injured after gunshot occurred when his cousin (aged over 17 years) were trying to click a picture with the pistol.
"The license is in the name of Promod Chauhan, the father of the juvenile. The father was outside for his work. He is working as a property dealer, the DCP said.
Police will be investigating whether there was any negligence on the part of the minor's father, he said.
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