"Kim Hyok Chol was investigated and executed at Mirim Airport with four foreign ministry officials in March," an unnamed North Korea source said, according to the Chosun Ilbo, adding that they were charged with spying for the U.S."
reuters.com/article/us-nor…
They were executed clear back in MARCH.
"Shin Hye Yong, the INTERPETER for Kim Jong Un at the Hanoi meeting, is also said to have been DETAINED in a POLITICAL PRISON CAMP, for undermining the authority of Kim Jong Un by making a critical INTERPRETATION MISTAKE."