One person, who was among the five injured in police firing on the mob, succumbed today, police said.
Neighbouring Assam was put on high alert by the Centre following the incident in Dimapur as the rape accused Farid Khan is believed to be from that state.
Khan had allegedly raped a Naga woman several times before he was arrested on February 25.
Karai Chawang, Press Officer to Nagaland Chief Minister T R Zeilang, told PTI on phone from Kohima that a meeting of the state cabinet decided to suspend the district collector, SP and SP, Central Jail, for "their failure to control the situation."
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The meeting also decided to arrest all those involved in pulling the rape suspect out of the prison on Thursday, parading him naked and lynching him, he said.
Chawang identified the deceased rape suspect as Farid Khan.
He said curfew remained in force in Dimapur where the situation was "under control."
Jamir said police could not prevent the mob attack on the jail as the securitymen were vastly outnumbered and there were several school children in the mob.
Asked to comment on reports that the rape accused was a Bangladeshi immigrant, Jamir said "I cannot tell you anything on that now and it is a matter of investigation.