Michael Trevane was an Irish musician who married Marian Dolarhyde in Missouri and fathered future serial killer, Francis Dolarhyde. Trevane was an alcoholic who split with Marian before the birth of his son.
Unbeknownst to Trevane his wife managed to get their marriage annulled, with no mention of a child in the annulment proceedings. A few years later when he had sobered up, he called her at work and he told her he had been saved and wanted to know if he, Marian, and the child he "never had the joy of knowing" might make a new life together. Marian told him the child was born dead and she hung up.
Subsequently he showed up drunk at her boardinghouse with his suitcase, and got in a fight with Marian where she revealed the Francis was alive and had been born with a cleft palate and kicked him out of her house and told him never to call again, which he did.
Years later, drunk and brooding over Marian's rich new husband and her fine life, he called Marian's mother and let her know that she had a grandson. A week later a Kansas City streetcar ran down and killer Michael Trevane.
"HANNIBAL" (Four years before)
Since Michael Trevane is only tied to the Francis Dolarhyde case, it is unlike he will appear before Season 4.