The National Investigation Agency has arrested a self-styled sergeant major of NSCN-IM group in connection with the killing of Arunachal Pradesh MLA Tirong Aboh in May this year, an official spokesman said on Monday.
The 37-year-old Ellie Ketok was arrested on Sunday from Nagaland's Dimapur by a joint team of the terror probe agency and the Army, the spokesman said.
He said the accused was a part of killing team, and actually fired on Aboh and others on May 21 this year.
The NIA has earlier arrested five persons -- Sethok Kangnong, Napong Jenpi alias Jenpi, Jai Kishan Sharma, Luckin Mashangva and Yangte Josaham -- in this case.
The Arunachal Pradesh government had decided to handover the killing of Aboh, an MLA from Khonsa West, and nine others by suspected NSCN-IM militants to the NIA.
Nationalist Peoples' Party (NPP) MLA Aboh, his son and nine others were killed when suspected NSCN-IM militants opened fire at their vehicles near 12 Mile area in Tirap district on May 21.
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The MLA along with his relatives was on his way to Khonsa from Dibrugarh in Assam when the attack happened.
The National Socialist Council of Nagaland (NSCN-IM) is in ceasefire with the Centre since 1997 and negotiations are on to resolve the decades-old Naga political problem.
A framework agreement was signed between the Centre and the NSCN (IM) in August 2015.