(1) A member who becomes disabled:
(a) before completing 20 years of membership service must receive a disability retirement benefit equal to one-half the member's final average compensation; or
(b) after completing 20 years or more of membership service must receive a disability retirement benefit equal to 2.5% of the member's final average compensation for each year of service credit.
(2) A member who becomes disabled as a direct result of the member's service in the line of duty:
(a) before completing 20 years of membership service must receive a line of duty disability retirement benefit equal to one-half of the member's final average compensation; or
(b) after completing 20 years or more of membership service must receive a line of duty disability retirement benefit equal to 2.5% of the member's final average compensation for each year of service credit.
(3) Upon the death of a member receiving a disability retirement benefit under this section, the member's surviving spouse or dependent child is eligible for benefits as provided in 19-9-804.