40 ILCS 5/12-140
An employee who becomes disabled as the direct result of injury incurred in the performance of an act of duty and cannot perform the duties of the regularly assigned position, is entitled to receive, while so disabled, a benefit of 75% of the salary at the date when such duty disability benefits commence, subject to the conditions hereinafter stated.
In the event an employee returns to service from any duty disability and renders actual employment in pay status performing the duties of the regularly assigned position for at least 60 days, and again becomes disabled, whether due to the previous disability or a new disability, the salary to be used in the computation of the benefit shall be the salary in effect at the date of the last day of service prior to the latest disability.
The employee shall also receive a further benefit of $20 per month on account of each eligible minor child as prescribed in Section 12-137, but the combined benefit to employee and children shall not exceed the annual salary at the date of such disability less the sums that would be deducted from his salary for service annuity and spouse's service annuity.
The benefit prescribed herein shall be payable during disability until the employee attains age 65, if disability is incurred before age 60, or for a period of 5 years if disability is incurred at age 60 or older. If the disability is incurred after age 65, this 5 year period may be reduced if such reduction can be justified on the basis of actuarial cost data approved by the board upon the recommendation of the actuary. At such time if the employee remains disabled the employee may retire on a retirement annuity.
If an employee dies as the direct result of injury incurred in the performance of an act of duty, or if death results from any cause which is compensable under the Workers' Occupational Diseases Act, a surviving spouse shall be entitled to a benefit (subject to the modifications stated in Section 12-141) of 50% of the employee's salary as it was at the date of injury resulting in death, until the date when the employee would have attained age 65, if injury was incurred under age 60, or for a period of 5 years if disability is incurred at age 60 or older. After such date, the spouse shall be entitled to receive the reversionary annuity that would have been fixed had the employee continued in service at the rate of salary received at the date of his injury resulting in death, until the employee attained age 65 or as stated herein and had then retired.
If a spouse remarries while under age 55 while in receipt of a benefit under this section, the benefit shall terminate. Such termination shall be final and shall not be affected by any change thereafter in his or her marital status.
40 ILCS 5/12-140