[1] In April 2016, Den disappeared from Chaiyaphum province's Khon San district amidst a land dispute, and has been missing since.
[2][3][4] Den campaigned for land rights for poor residents of Chaiyaphum province in northeastern Thailand.
[1] On 10 March 2016, a court writ was circulated by military and forest officials ordering residents in Kok Yao to vacate their homes with 8 days, as the properties were claimed to encroach on the Phu Sum Puk Nam Sanctuary.
[1] On 16 April 2016, Den disappeared after entering the Khok Yao Forest to collect bamboo shoots and mushrooms.
[4] Human remains were later found that were believed to be Den's, according to a Central Institute of Forensic Science investigation.