What was the cause of his death?

I had a parrot for two years who died on sunday night. Prior to this he was diagnosed with a wound problem (down below), which he kept picking on and thus had to wear on a collar to prevent this. He seemed his usual self, talking and quite content. However my parrot was found at the bottom of his cage. He was struggling to breathe, i tried to give him water. But all i heard was a scream and than instantly he died. Now i have been told there was a fly killer room fragrance, that placed near him. Could this have killed him. Im so confused and upset.