Muhammad Majid, a resident of Shehar Sultan in the suburbs of Muzaffargarh, married Samina Bibi of Karachi in court after her parents refused to agree to the wedding.
Samina's family had registered a case of kidnapping against Majid and police arrested his father and brother for investigation.
Today, Samina's brother Abdul Sattar and three other men came to Shehar Sultan and set Majid on fire after sprinkling petrol on him.
He sustained serious burn injuries.
Majid was taken to hospital in a precarious condition.
More than 90 per cent of his body was burnt, police and hospital officials said.
Police have launched a search for the men who attacked Majid but were yet to make any arrests.