He definitely intended for the ex-addict to overdose. It was the same morphine as the bottles that he planted in the nurses bathroom.

This was one of his best lines. He counters Columbo's questions with ones of his own. Columbo says, "Gee, you ask tough questions." Mayfield gives a big smile and says, "So does a jury."

Of course he died! Or else he would tell Columbo about "some guy that was waiting in my apt. and pumped me full of morphine". If he hadn't died they would have mentioned it. No lose ends.

Nice tight jeans on Jared Martin by the way!