He was declared auxiliary bishop of Palai on 24 August 2012 while serving as the diocesan pastoral coordinator.
His episcopal ordination was on 1 October 2012 by Joseph Perumthottam at St. Thomas Cathedral, Palai.
In August 2022, Muricken said that "God inspires me to go into solitude" and resigned from his post as auxiliary bishop to continue his life as a hermit, moving to the hermitage following approval from the Syro-Malabar synod.
[citation needed] On 19 September 2013, he along with the other newly appointed bishops from around the world, was received in audience by Pope Francis at the Vatican.
As the general convenor, he was instrumental in the successful conduct of the 31st Plenary Assembly of Catholic Bishop's Conference of India (CBCI) which was hosted by the eparchy from 5 to 12 February 2014.