Ind. Code § 2-3.5-4-6
(a) The surviving spouse of a participant who:
(2) on the date of death:
(C) had a permanent disability and was receiving benefits under section 5 of this chapter;
is entitled, regardless of the participant's age, to the benefit prescribed by subsection (b).
(b) The surviving spouse is entitled to a benefit for life equal to fifty percent (50%) of the amount of retirement benefit that:
As added by P.L.6-1989, SEC.1. Amended by P.L.99-2007, SEC.2.