Former Minister of Micro, Small and Medium Enterprises Bhagwat Sharan Gangwar's nephew Abhinav (22) was also injured in the incident that took place in Premnagar area this evening.
The deceased, identified as Rajpal Singh (40), is Gangwar's elder brother's son-in-law. The accused has been arrested, police said.
The incident was triggered after Rajpal had some dispute with one Satyendra Singh, a low-rank former armyman, who then opened fire on the duo with his licensed gun, police said.
Gangwar, a local MLA, was minister of state of MSME in the Akhilesh Yadav government but was later sacked.