Episode 123 of "MacGyver"
s06e19 Strictly Business

After enlisting MacGyver's help in saving his sister (from a previous episode), Murdoc wants to come out of retirement, but his former employers at Homicide International request that he take out MacGyver as a demonstration of his sincere desire to rejoin them. Knowing that MacGyver is the only contract that he failed to execute, Murdocs agrees to "clear" his otherwise perfect record. MacGyver, returning home one night, finds Murdoc waiting for him at his dinner table- with dinner waiting. Murdoc sets MacGyver up for execution and forces MacGyver to admit defeat to him- or be killed via cyanide. After that, Murdoc warns MacGyver of his intention to kill him and then leaves. MacGyver knows the professional killer is not bluffing- and he knows he will use anybody and do anything to get to him...