Short story

In the class of L/L Writing we have to write a short story that had to finished with "that was the last time I saw him/her"

                                                    The Party
911?!... -shouted Mike ,"There was a murder in my house!".
That same night , Mike was in the police station saying what happened, What he saw and if he could  describe the murder.
-"Please Mike , tell me the truth, What did you see this morning when you arrived home?".- Asked the detective .-"Okay , this is a long story :
Yesterday I was going to go to a party with my friend Josh.One minute before the party, Josh told me that he was not going to the party because he had problems with some bad people .He also asked me if he could sleep in my house only for one night because those peolpe who are looking for him knew his adress, and I let him stay.
Whatever , I went alone to the party and I had a good time meeting new people .But...there were some guys who knew that I was going to go to the party with Josh.I called him to tell him that some guys were looking for him, Josh told me that he don't know them and please if I could not give the address where he was , but it was too late.
The party finished and I returned home in the morning and when I arrived , I could see a big graffity of blood saying "He paid the consequences", when I entered home Ibsaw two teenagers finishing painting other graffities on the wall .I shouted at them and I could see the face of one of them , It was a 18 years old boy with a hat.That was the last time I saw him.