Mohammed, who trained as a medical doctor, died on Thursday in Kano.
According to family sources, the former lawmaker reportedly died at an isolation centre but was not positive for the coronavirus.
He was one of the founding members of the People’s Redemption Party (PRP) in 1976 under the leadership of the late Aminu Kano.
He also served as the national deputy chairman of the Social Democratic Party (SDP) in the north-west.
In October 2018, he was selected as running mate to Donald Duke, presidential candidate of the SDP.
He was known to be very outspoken about political matters, and usually spared no words in his criticism of the President Muhammadu Buhari administration.