Egianus was appointed as the Commander of Ndugama III Command on 16 October 2018.[7] Egianus claimed that the group received weapons and ammunition from Indonesian National Armed Forces soldiers and police officers.[8]
Egianus's first known attack was in December 2017, when his group killed Yovicko Sondakh, a Trans-Papua Highway worker in Mugi District. In 2018, Kogoya was responsible for the Kenyam Airport shooting, abducting teachers and medical personnel in Mapenduma [id], and Nduga massacre.[9]
In February 2022, Egianus announced that his group underwent restructuring and expanded their area of operation to Intan Jaya Regency.[10] In the aftermath of the OPM attack at the marine post in Kenyam on 26 March 2022, Indonesia wanted to have negotiations with Egianus Kogoya. Egianus, however, refused the dialogue offer.[11] He claimed responsibility for the killing of 11 people in Nogolait, whom he accused of being spies.[12] On 16 August 2022, he issued a statement to the Nduga Regional Government and TNI imploring them not to enter and develop Alguru [id] since it was an OPM base.[13]
On 7 February 2023, he ordered his group to attack a plane in Paro and kidnap the pilot, Philip Mehrtens and the Indonesian passengers (Demanus Gwijangge, Minda Gwijangge, Pelenus Gwijangge, Meita Gwijangge and an infant, Wetina W).[14][15] The motive behind the pilot kidnap was that he wanted Papua to gain international attraction and became an independent state.[16] He later released a video in May 2023. In the video, he threatened to execute the pilot if Indonesia still refuses to negotiate and demanded Indonesia and New Zealand have a dialogue on Papuan independence.[17]
Egianus threatened to assassinate Edison Gwijangge, the acting regent of Nduga for visiting certain districts in Nduga by plane on 4 October.[18] On 16 October, Egianus's faction and Elkius Kobak's faction killed seven miners and burned three excavators, two trucks, and miner camps in Seradala District [id], Yahukimo.[19]
During the 2024 Nduga Regency election [id] campaign, Egianus endorsed Edison Gwijangge's candidacy and asked army and police to provide assistance to him.[16] Egianus freed Mehrtens on 21 September 2024.[20] Sebby Sambom [id], the spokesman of TPNPB, claimed that a local politician bribed Egianus to release Mehrtens.[21] However, he denied Sambom's allegation and claimed that he freed the pilot on humanitarian grounds. In an interview with BBC in October 2024, he threatened to kill all non-Papuan civilians as he believed that they were the main problem of the Papua conflict and expressed a desire to kidnap foreigners.[16]
In June 2025, Egianus was discovered to own a weed plantation in Kurima District, Yahukimo Regency. It was believed that he traded marijuana for weapons.[22]
In October 2025, Ipe Kogoya, Egianus's brother, was killed in Soanggama, Central Papua in a clash between TNI and the Intan Jaya faction led by his other brother, Undius Kogoya.[23] On the 23rd, Undius was also announced dead due to sudden illness in Wandai, Intan Jaya.[24]