How did Irie Miyuki die?

Because of a friend's bad joke. Irie Miyuki is a Japanese anime work AngelBeats! The character died because of a friend's spoof, in the TV "Angels Beat! The first episode, 18: 25, first appeared. She is the most timid character on the front line. She is a girl who hates horror stories very much. She has long purple hair. Even though she is dead, she is afraid of ghosts.