Del. Code tit. 18, § 6706

If any claimant under this chapter is entitled to receive, as a result of the same disability in the line of duty which gave rise to a claim under this chapter, any payment of state, federal, county or municipal funds or insurance proceeds from a policy paid entirely by the state, federal, county or municipal government in the form of a disability benefit, other than that provided for under this chapter, the payment pursuant to this chapter shall be reduced by the amount of such other payment or payments to which the claimant is entitled.