41 C.F.R. § 303-70.4
Limitation on duplicate death-related expense payments
Agencies will not pay death-related expenses under this chapter when the same expenses are payable under other United States laws. Specifically, when an employee dies from injuries sustained while performing official duty, death-related expenses are payable under the Federal Employees' Compensation Act (FECA), 5 U.S.C. 8134.