Jesse grew to be a weak and sickly child, incapable of being trained to be a warrior, to the point where his mother even begged to not have him marked with runes when he was a child, though he survived this painfully. When he was sixteen, Tatiana was finally told that he could no longer live and soon succumbed to his illness.
Even nine years after his death, his lonely mother has yet to move on from his death. She called for Magnus Bane in hopes of resurrecting Jesse, a job Magnus refused to do.
- The Midnight Heir (mentioned only)
- The Last Hours (will appear)
- Lady Midnight (mentioned only)
- Lord of Shadows (alluded to)
- In The Midnight Heir, Jesse apparently died when he was 16 due to sickness. It is implied that his mother is planning to use dark magic and sacrifice five Shadowhunters to revive him, which would explain why the "found" family tree states that Jesse died at the age of 59.
- The mystery of Jesse's state boggles the writers' mind of Lucie Herondale.
- According to the found family tree, Jesse would apparently go on to marry Lucie and had children with her.
- This mystery is expected to be explored in The Last Hours, as he is also set to be a main character in the upcoming trilogy.
- Jesse is set to be a pianist.
- ↑ The Midnight Heir
- ↑ "A mystery that occupies the busy brain of writer [Lucie Herondale]", Cassandra Clare on Tumblr
- ↑ "... and Jesse) are the main characters in the book." Cassandra Clare on Tumblr
- ↑ "Jesse Blackthorn used to play the piano when he was alive." Cassandra Clare on Tumblr