H. P. Lovecraft
From Gnomon Chronicles

Reconstructed full-color diagram of the Rubric hierarchy.
H. P. Lovecraft was a poet who fought evil.
Extract of Radium
Extract of Radium was a popular condiment during Lovecraft's childhood.
He is known to have sprinkled it on his breakfast cereal "religiously" (citation needed).
Murder

Although badly faded, this medieval manuscript (the so-called "Red Charter") suggests that the The Rubrics were involved in the blood sacrifice of Lovecraft. See also Posthumous holography of H. P. Lovecraft.
Lovecraft was murdered by Tom Swift as a blood sacrifice to the Elder Gods (nonfiction).
Possible involvement of Rubrics
The Rubrics were an ancient tribe of warriors who worshiped the color red.
Scholars have speculated that Swift hired the Rubrics, or used the Rubrics in some way, to carry out the blood sacrifice of Lovecraft.
Fiction cross-reference

John Brunner working undercover as Mihkail Kaufman, investigating rumors of posthumous criminal activity in Lubin Manufacturing Company's secret laboratories.