The radio station of Yemen's Houthi-run interior ministry says the militia's former war ally turned adversary, ex-president Ali Abdullah Saleh, has been killed as fighting racked the capital Sanaa.
However, there was no independent confirmation.
Unverified footage circulated by Yemeni social media users on Monday appeared to a show corpse resembling Saleh. Armed militiamen unfurled a blanket containing the corpse and shouted, "praise God!" and "hey Ali Affash!", another last name for Saleh.
The radio station said the official Houthi TV station would soon broadcast footage of Saleh's dead body.
Saleh's party denied to Reuters that their leader had been killed and said he was still leading forces in heavy fighting in Sanaa that has killed at least 125 people and wounded 238 in six days, according to the International Committee of the Red Cross.
His whereabouts were unknown and he has made no public appearances since the reports of his death surfaced.
Earlier on Monday, Houthi forces blew up Saleh's house in Sanaa and came under aerial attack by Saudi-led coalition warplanes for a second day, residents said.
The Saudi-led air campaign, backed by US and other Western arms and intelligence, has killed hundreds of civilians but has failed to secure the coalition any major gains in the nearly three-year-old campaign to restore Yemen's internationally recognised president, Abd-Rabbu Mansour Hadi, to power.
Saleh's loyalists have lost ground on the sixth day of heavy urban warfare with the Iran-allied Houthi militia during which the casualty toll has rapidly mounted in Sanaa.
Sanaa residents reported intense fighting overnight and into the morning with families cowering in their homes as explosions rocked the city. Coalition air strikes hammered Houthi positions in an apparent bid to shore up Saleh's forces, witnesses said.
The re-alignment of Saleh's forces with the Saudis would mark a significant turn in a war that is part of a wider struggle between regional powers Saudi Arabia and Iran.
The bloodshed has compounded the woes of one of the Arab world's poorest countries and left at least 10,000 dead as hunger and disease have spread.