Murder Mystery #2

Upon reaching each room, he found out that the window facing the dead body was closed. He had to open the window himself. This tells that there was somebody else with him who closed the window. If he would have committed suicide, at least one window would have been open.

#38 Suicide Note

A suicide note was left, but was it really a suicide? Or is there more? Help to solve the mystery.

If he comitted suicide, then how could he rewind the tape?

#24 Murder Mystery

Jason was the murderer. The numbers stand for the first letter of the appropriate month. 6=J, 4=A, 9=S, 10=O and 11=N.