Is sheikh Ibrahim Elzakzakhi truly dead?

A post on Rariya has just indicated that the leader of theIslamic Movement of Nigeria IMN Sheikh Ibrahim Elzakzakhi who has been in detention for over two years now has passed away after a brief illness. Could this be true?

This was the Facebook post by Rariya on their page.
Rariya
INNALILLAHI WA,INNA ILAIHIRRAJI,UN
…Jami’an Tsaron hukumar Farin kaya (DSS) Sun bayyana Mutuwar shugaban jagoran Harkar musulunchi (shi,at) Mal ibrahim ya’aqub Al-zakzakhi
sakamakon Gajeruwar Rashin Lafiya