>> santosh then drives away, promising to come right back with a down payment for the execution. >> we did follow him. he did go to the citibank and then went to another small corner store to use the cash machine there also. >> still santosh promises there will be an even larger payment once he receives his wife's life insurance settlement. to substantiate his claim, he drops his son off at home and returns to mcdonald's with the policy. >> this was the final nail, so to speak, in the coffin as far as, like, closing this case. >> but his unpredictable nature thwarts efforts to make a quick arrest. >> let's go around the corner. we've been sitting here for a long time. >> with the rest of the support team helplessly looking on, the undercover enters the suspect's mercedes as santosh drives out of camera range.