Try and solve the mystery

I like mystery riddles, although I'm not the best at them. I'll start by posting a riddle, whoever solves it can post one of their own. An old man ankit lives alone in a flat. Because of his age , he is not able to move comfortably and hence most of the things used to be delivered to his house. On Friday while delivering the mail , postman feels something suspicious in the flat and try to look inside through the key hole and he saw a blood filled body of the old man. CID arrived the scene. On the outside of flat , he found two bottles of warm milk , Tuesday newspaper, some unopened mails , some gifts. CID waste no time to find the murderer. Who was the murderer ? Ps. I failed at this one

I'm guessing the newspaper guy. Since there's only one newspaper there he probably didn't want to deliver more since the old was dead already.

http://i892.photobucket.com/albums/ac127/Kamichuuu/1257219895646.jpg I'M SMART!

Five suspects are called into police headquarters for questioning. They give the following statements. A: "One of the five of us is lying." B: "Two of the five of us are lying." C: "I know these guys, and three of the five of us are lying." D: "Don't listen to a word they say. Out of the five of us, four are lying." E: "All five of us are dirty rotten liars!" The police only want to release the suspects who are telling the truth. How many people should they let go?