Mafia 5. Seventeen Moments of Spring.

Major - seems like a valiant officer whose defense triggered during an attack.

What?) Officers don't have defense. I don't understand why he wasn't killed; it doesn't seem like a doctor came to him. Or was it not a murder at all?

The killer apparently came down from the attic, where a large piece of rough fabric of unknown purpose was found.

In my opinion, the hint is hidden here; we need to think.

Added 6 minutes later
Tengro has something about a scarf in his signature. Couldn't that be the fabric?

Kyle, what kind of animal is on your avatar? It looks like something was taken off of it... fabric))