Kim Jong Nam believed his youngest brother, Kim Jong Un would fail as North Korea's leader, according to Gomi - though the two brothers never met because of the ancient practice of raising potential successors separately.
"The suspect was positively identified from the CCTV footage at the airport and was alone at the time of the arrest", police chief Khalid Abu Bakar told reporters yesterday.
A post mortem on Mr Kim's body was completed yesterday evening despite objections from North Korean officials in Malaysia, Malaysian government sources said.
Police released a statement saying the woman was carrying Vietnamese travel documents when she was arrested at Kuala Lumpur International Airport.
In Washington, the State Department said it was aware of reports of Kim Jong Nam's death but declined to comment, referring questions to Malaysian authorities.
South Korean media reported that Kim Jong Nam was assassinated by two women. The source gave no further details.
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This took place despite North Korean objections about an autopsy taking place. There are also reports that China has been supporting Kim Jong-nam financially, in case of an emergency in which Kim Jong-un would need to be replaced. "He wants North Korea to embrace economic reform and open its doors".
Kim Jong Nam was believed to be close to his uncle, Jang Song Thaek, who was North Korea's second most powerful man before being executed on Kim Jong Un's orders in 2013.
"It seems probable that the motivation for the murder was a continuing sense of paranoia on the part of Kim Jong Un, which may be a well-placed paranoia", Mr Tokola wrote in a commentary overnight.
Kim Jong Nam and Kim Jong Un have the same father, late dictator Kim Jong Il, but different mothers. Neither of his sisters, who are thought to be part of the North Korean government, would stand much of a chance of rising to power in the highly patriarchal country. Kim Jong Nam had said he had no political ambitions, although he was publicly critical of the North Korean regime and his half brother's legitimacy in the past. He had also once told a Japanese TV station that he was personally opposed to a third generation of Kims ruling North Korea. Kim Jong Nam was the eldest, followed by Kim Jong Chul, who is a few years older than Kim Jong Un and is known as a playboy who reportedly attended an Eric Clapton concert in London in 2015.
Recently, South Korea had tried to negotiate Mr Kim's defection but failed, The Korea Herald reported.