The murder of Mathabar Singh Thapa led to the political instability in Nepal . Though , Fatte Jung Shah was declared the Prime Minister ( 1845 September 23 ) , Gagan Singh had more regiments ( 7 ) of the army under him and was more powerful . Jung Bahadur Rana also had 3 regiments under him . Fatte Jungh Shah himself had 3 regiments of the army under his control . Also Gagan Singh had the special support of the queen Rajya Laxmi Devi . British Resident Sir Henry Lawrence once mentioned that , " If there is struggle for power , that struggle will be between Gagan Singh and Jung Bahadur . " Ultimately , the extreme power of Gagan Singh led to him being assassinated by King Rajendra and Prime minister Fatte Jungh Shah in 1846 September 14 at 10 P.M. . The assassination of Gagan Singh led to the Kot massacre and ultimately , the rise of Jung Bahadur Rana
Kot massacre
Kot massacre
Mathabarsingh Thapa