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The Shadow in the Locked Room
A reclusive man has extremely strong vigilance. Every night before going to bed, he will definitely lock the door from the inside, fasten the security chain, check that all windows are closed and locked tightly, and never open the door for anyone late at night. That night, he completed all the locking procedures as usual and went back to his room to rest peacefully. The next morning, neighbors found him brutally murdered in his own living room. The doors and windows of the house are completely intact, all locks show no signs of prying or damage, and there are no footprints or traces of an outsider breaking in at the scene. Suicide and intruder homicide are ruled out, and no outsiders have entered or exited the building at all. Please restore the full truth.
A reclusive man has extremely strong vigilance. Every night before going to bed, he will definitely lock the door from the inside, fasten the security chain, check that all windows are closed and locked tightly, and never open the door for anyone late at night. That night, he completed all the locking procedures as usual and went back to his room to rest peacefully. The next morning, neighbors found him brutally murdered in his own living room. The doors and windows of the house are completely intact, all locks show no signs of prying or damage, and there are no footprints or traces of an outsider breaking in at the scene. Suicide and intruder homicide are ruled out, and no outsiders have entered or exited the building at all. Please restore the full truth.

Since outsider intrusion and suicide are both ruled out, how did he die inside the locked room?
Since outsider intrusion and suicide are both ruled out, how did he die inside the locked room?