Kim Name and picture from twetch — not on-chain. The signature is; the profile is not.

@789
Greetings from Sylvester.
Sivestor will find you.
And he'll put glasses on your ass.
Now dig the grave.
Sylvester will call all his friends.
We'll find you.

Yes you shouldn't joke with athletes.
They'll definitely find it. (BitcoinAssassin)