Mo. Rev. Stat. § 561.026: Disqualification from voting and jury service.

Notwithstanding any other provision of law except for section 610.140, a person who is convicted:

(1) Of any offense shall be disqualified from registering and voting in any election under the laws of this state while confined under a sentence of imprisonment;

(2) Of a felony or misdemeanor connected with the exercise of the right of suffrage shall be forever disqualified from registering and voting;

(3) Of any felony shall be forever disqualified from serving as a juror.