While you cannot foresee all the effects of your actions this does not exonerate you from accepting responsibility for the consequences.

To accept responsibility is one thing. To have it thrust on you is another matter. Those doing the thrusting had better be sure of themselves first.

Given that the nurse would still be alive if this prank had not been perpetrated the radio station, 2dayfm, is responsible for her death, albeit unintentionally.

You must be the only person in the world who knows, as yet, that, but for this, she would still be alive. And the radio station is responsible for allowing two DJs to carry out a stupid prank. That's about it. Stupid, irresponsible, misguided, we can probably all agree. But a prank of the type that almost never develops into this type of tragedy. There would be lots of things we'd hold back from doing if we all had a crystal ball. You are being far too judgemental far too early.