Some fans were particularly perturbed by the unexpected timing, saying: "You know Shortland Street has changed when they don't just kill a character at the end of the year, but a main character dies on a Tuesday night in April."
Another posted on Twitter: "What have we learned from Ali's death #shortlandstreet? Diversity is dead."
Others simply commented that they would no longer be watching.
One particularly fired up fan wrote: "Take your show...and f*** off. You lost a LOT of viewers tonight... Enough is enough. It ends here #RIPAli"
Others commented that they had been watching for decades, but would no longer be tuning in.
Shortland Street airs at 7pm weeknights on TVNZ 2.