Riddles

Hello guys,

this page is for all the "Riddles of Muerder"-Storys that I knew.
If you have nothing to do or feel boring look at this page and I
will present you a riddle that you have to solve.

The first one is:

John and Maria are lying dead on the floor. They are surrounded
from pieces of glass and there is water on the floor. Furthermore,
the window is open. What happend?

You can ask me questions but only this ones which could be
answered by yes or no.