Libya's interim rulers say they will declare their country's liberation on Sunday, whereupon interim prime minister Mahmoud Jibril says he will resign.

Meanwhile, a new video emerged Saturday showing the man who some anti-Gadhafi fighters say shot and killed the deposed dictator.

Officials from the governing National Transitional Council (NTC) said the liberation announcement would be made in the eastern city of Benghazi, the Libyan revolution's birthplace, a day later than originally planned. No reason was given for the 24-hour delay.

Jibril said Libyans should be allowed to vote within eight months to elect a national council that would draft a new constitution and form an interim government.

Gadhafi's purported killer shows how he shot Libya's former dictator. Reuters

Jibril made that announcement Saturday as he attended the World Economic Forum in Jordan. He also said he expects to step down once liberation is declared, reiterating a promise he made earlier in the month.

The latest amateur video purporting to show Gadhafi's body was obtained by the Reuters news agency and depicts NTC fighters in a van travelling along a highway between Gadhafi's hometown, Sirte, and the coastal city of Misrata. A half-naked corpse on the floor of the van has a patch of bandages on its chest and appears to be the ousted Libyan ruler.

Later in the video, fighters gather around a bald, goateed man in combat fatigues. "He's the killer. And I am the witness who saw him.... He did it in front of me. I saw it in front of me," one militant says, according to a Reuters translation.

Another NTC fighter hugs the goateed man and says, "He is the guy who killed him, boys!"

The alleged killer brandishes a gun and points it at a fellow figher in an apparent attempt to show how he shot Gadhafi. He later pulls out a second gun and points both weapons in the air.

The video raises further questions about how the Libya's ex-leader died.

The United Nations human rights office says it's concerned he was summarily executed after his capture Thursday on the outskirts of his hometown Sirte, two months after he was driven from power and into hiding.

In one cellphone video recording the chaos that followed Gadhafi's capture, he is seen wiping blood away from his head. There seems to be no wound in that video. In a second video, there is a bullet wound in the same spot on his head, raising speculation he was shot execution-style.

The NTC maintains he was killed in crossfire between his supporters and fighters for the new regime after he was pulled from a culvert where he had been hiding.

The BBC reported an NTC official as saying Saturday that Gadhafi's body has undergone a post-mortem examination and will be handed over to his surviving family. However, Al Jazeera reported NTC officials as saying earlier that no autopsy would be needed, despite the questions around his death.

People stand in line to see the body of former Libyan leader Moammar Gadhafi in Misrata. Saad Shalash/Reuters

The CBC's Derek Stoffel, reporting from Tripoli Saturday, said human rights groups are concerned about how Gadhafi met his end, but "Libyans mostly don't care how he died."

"I've been speaking to many here who say after 42 years of his rule he deserved what he got, although there are some who say they would have liked to have seen a trial for the crimes he carried out against the Libyan people," Stoffel said.

Lineups to see body

Omar Turbi, an American advisor to the National Transitional Council, says Libyans are looking forward, not backward.

"The feeling is everybody's happy. there are no considerations for legal ramifications [regarding] how he died because of all the vengeance and all the built-up feelings toward Gadhafi. It doesn't matter how he died. It's the end of an era that has been a horrible history of Libya," Turbi said.

Opposition forces stepped up the search for Gadhafi after they swept into Tripoli and seized control of most of the oil-rich North African nation.

Their campaign was stalled by fierce resistance by Gadhafi loyalists in Sirte, Bani Walid and pockets in the south.

Gadhafi's body had become somewhat of a tourist attraction. It was being held in a freezer in a shopping mall in Misrata, east of Tripoli, as the debate continues over what to do with his remains.

People crowded into long lines to get a chance to view the body, which was laid out on a mattress.

The body of Gadhafi's son Mutassim had been moved from another location in Misrata and placed next to his dead father, along with the body of Abu Bakr Younis Jabr, who led Gadhafi's armed forces. They, too, were killed near Sirte.

Mohamed Sayeh, a senior member of the NTC, said Friday that Moammar Gadhafi's body will be buried according to Islamic tradition, but the funeral will not be public.