Naw Kham was captured last April in Laos and extradited to Kunming to stand trial.

BBC: China media: Mekong justice

Private First Class Kham Xiong came to America from Thailand as a small child.

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China's state television channel CCTV aired an interview with Naw Kham on Thursday.

BBC: China parades foreign Mekong killers before execution

The other men were Hsang Kham from Thailand, Yi Lai, who is stateless, and Zha Xika from Laos, said the Xinhua news agency.

BBC: China parades foreign Mekong killers before execution

Naw Kham was eventually captured and extradited to China to stand trial for the killings of 13 Chinese crewmen on Mekong River in 2011.

BBC: China media: Hacking denial

State media said Naw Kham and his subordinates had collaborated with Thai soldiers in launching an attack on the ships, the Hua Ping and Yu Xing.

BBC: China parades foreign Mekong killers before execution

Among the prisoners was Naw Kham, a Burmese man thought to have been one of the most powerful warlords in the Golden Triangle of Thailand, Laos and Burma.

BBC: China parades foreign Mekong killers before execution