Sec. 7.03. SURVIVING SPOUSE OF FORMER FIREFIGHTER. (a) An immediate monthly benefit is payable to the surviving spouse of a former firefighter who:

(1) before termination of employment with the fire department had accumulated at least 10 years of service credit in the fund and had made required contributions to the fund for a period of at least 10 years; and

(2) did not withdraw the member's contributions from the fund at the time of or after the termination of employment.

(b) If the former firefighter died before attaining 50 years of age, the benefit is payable only if the spouse was married to the former firefighter on the date of the former firefighter's termination of employment with the fire department.

(c) If the former firefighter died after attaining 50 years of age, the benefit is payable only if the spouse was married to the former firefighter when the member attained 50 years of age.

(d) The amount of the benefit payable under this section is 75 percent of the retirement benefit the former firefighter either was receiving or was entitled to receive at age 50.