I hesitate between Bertram and the Sheriff.
But I think there are also clues in Blake's poem... you may find more:

Tyger! Tyger! burning bright

In the forests of the night,

What immortal hand or eye

Could frame thy fearful symmetry? --> Kirkland Twins?



In what distant deeps or skies

Burnt the fire of thine eyes?

On what wings dare he aspire?

What the hand dare sieze the fire?


And what shoulder, and what art.  --> Tatoo on his left shoulder

Could twist the sinews of thy heart?

And when thy heart began to beat,

What dread hand? & what dread feet?


What the hammer? what the chain?

In what furnace was thy brain?

What the anvil? what dread grasp

Dare its deadly terrors clasp? --> Handshake


When the stars threw down their spears,

And watered heaven with their tears,

Did he smile his work to see?  --> Smiley face after the murders

Did he who made the Lamb make thee?


Tyger! Tyger! burning bright

In the forests of the night,

What immortal hand or eye

Dare frame thy fearful symmetry?  --> Interesting... 'dare' instead of 'could'