-blood money-

1. Money paid to the next of kin of a person who has been killed by another. [ 1913 Webster ]

2. Money obtained as the price, or at the cost, of another's life; -- said of a reward for supporting a capital charge, of money obtained for betraying a fugitive or for committing murder, or of money obtained from the sale of that which will destroy the purchaser. [ 1913 Webster ]