The 46-year-old, half-brother of North Korean dictator Kim Jong-Un, was poisoned to death by two female operatives in Kuala Lumpur, Malaysia, on Monday.
His Facebook page was under the name 'Kim Chol', the same name used on the passport he had in his possession when he was killed.
He is show outside luxury hotels, casinos and on a yacht in photos he posted online - despite reportedly telling friends that he feared for his life and was 'on borrowed time'.
But his use of the social media site as well as commercial email addresses may have inadvertently led to his death, according to security experts
South Korean intelligence chiefs say he was poisoned by agents from the North as he walked through Kuala Lumpur International Airport on his way to board a flight.
Asian news websites are now reporting that the Facebook profile is that of the estranged relative of North Korea's dictator who had been living in exile in Macau.
A former intelligence secretary to South Korean President Lee Myung-bak claims that his 'careless' use of emails and social media may have prompted his assassination.
Cha Du-hyeogn told NK News Jong-nam was known to have used commercial e-mail addresses to communicate.
He said: 'Open activities like these do not look like they are coming from a person who is constantly under the death threats.
'I think it is possible that Kim (Jong-nam) was careless, leading to his unsuspecting death.'
Jong-nam's Facebook profile shows a squirrel along with a French flag filter - possibly added in solidarity with Paris in the wake of the November 13, 2015 ISIS terror attacks.