The science behind anger and how it affects self and others is documented. This isn't a anger management post, just what it can physically do.
I've wished people dead before. Then they did die.
Pretty sure it was a coincidence, either that or waiting a lot of time..
The energy you give off when angry does affect the energy of the other person's body. So, I believe it may be possible to wish, as you call it, someone dead or harm. At the same time, the anger is causing destructive forces within your own cells via chemical reactions. HPA axis reaction on body which leads to immune system dysfunction that can lead to system failure. The body's fight or flight from the anger releases adrenaline, cortisol, histamines, and cytokines which control everything from blood pressure to digestive problems and on the cellular level...destruction.
This somehow can apply to another living entity through the way we are all connected that can't be seen but has been proved. Remember the movie Men Who Stare at Goats? A spoof on the government trying to develope psychics who could literally kill by concentrating on a subject.
This has been tested on plants and bacterias.
Plants that were scolded, shown shears along with angry feelings directed at them daily withered or died.
The ones that were actually talked to and cared for with love, thrived. Majority of the time.
Another test involved diseases in test tubes in two rooms. One room had people go in everyday, express anger amongest themselves, argue, etc. and the germs thrived.
In the second room each day a group of people went in and used whatever their healing ideals were upon the bacteria, (prayer, reiki, thought), leave in peace and the disease bacterias died.
Just an interesting scientific observation of what emotions, concentrated thoughts and actions create and why. And we do what we will.