Who will replace to jack layton?

Jack Layton, the late leader of the New Democratic Party (NDP) in Canada, was succeeded by Thomas Mulcair in 2012 after Layton's passing. Since then, the NDP has had other leaders, including Jagmeet Singh, who took over in 2017. If you are referring to a specific context or recent developments regarding leadership, please provide more details for a more accurate response.