"The youth shot his homosexual partner killing him on the spot when he tried to kill the accused's mother following anarguement," inspector P D Parmar said.
The incident took place at Chauhan's house in Chunvalnagar slum in Bapu Nagar area.
According to police, the deceased went to Mehul's house today and had an argument with his partner's mother about why she objected to their same-sex relationship. During the argument he pulled out a country-made revolver and shot her.
"When the accused saw this, he snatched the revolver from his hand and fired three rounds at him, killing him on the spot," the inspector said.
The duo had been in a relationship for a year. The accused's mother was injured seriously and was undergoing treatment at a government hospital, Parmar said adding, the youth has been arrested and police is further investigating the issue.