Chinese authorities ordered her not to discuss the death or send information to contacts outside the area.
He had spoken out while under supervision after completing a lengthy term in prison.
Local residents say the security measures are more stringent than those in place for the 2008 Beijing Olympics.
Security is tight around the South Korean consulate in the city, with officials refusing to comment.
China's need for agricultural workers makes it profitable for North Korean laborers to make the risky crossing.
Vientiane has decided that it should decide who should get paid and how much for those displaced by the Lao-China railroad project.
Border Police in Rakhine state are charged for possession of nearly 300,000 methamphetamine tablets worth U.S. $480 million.
A pair of witnesses have become refugees and some members of the government critic's funeral committee have left or gone into hiding.