If there was a settlement agreement and it has been vioalated, you may sue the "friend" for breach of contract; a settlement agreement is enforceable like any other contract.If there was no actual agreement, just a promise to pay, you may still sue the "friend" for the fact the he, from what you write, either intentionally or negligently (i.e. carelessly) caused injury to your husband.Therefore, you would seem to have grounds to sue, but have to be able to locate the friend, and you need also to be able to collect--so if this person has little money, income, etc., it may be impossible to get the money from him, even if you sue him and win.You may wish to look into whether your husband, if he can't work, qualifies for either state disability or SSI. Good luck.