Prince Kumar consumed poisonous substance in the women's police station yesterday, police said.
Kumar was rushed to the district government hospital where he died during the treatment, they said.
Kumar was a JCB machine driver at the Kalisindh Thermal Power Project.
He had eloped with a girl on November 16, and on the complaint made by the girl's parent a case was registered against him at women's police station, police said.
According to police, the couple was found in a hotel of Chittorgarh and brought back to the district yesterday morning.
In the presence of police team and the girl's family, Kumar consumed the poisonous substance and later died during the treatment at the hospital, they said.
Meanwhile, district magistrate has ordered a magisterial probe into the matter.