SEOUL, South Korea — The son of Kim Jong-nam — the slain half brother of North Korea’s leader — appears to have emerged in a YouTube clip indicating that his family has gone into hiding after his father’s killing last month.

“My father has been killed a few days ago,” the young man, who called himself Kim Han-sol, said in the video posted on Tuesday. “I’m currently with my mother and my sister.”

In the 39-second video, the man shows what appears to be his North Korean passport as proof of his identity, but the particulars are blacked out.

“We hope this gets better soon,” he says before signing off.

The man was indeed Kim Han-sol, said Do Hee-youn, head of the Citizens’ Coalition for the Human Rights of Abductees and North Korean Refugees, based in Seoul, who added that he had been monitoring Mr. Kim’s whereabouts for years.