Through no fault of his own, my Nord has become a serial killer due to a few annoying quest bugs.

The quest bug involving a man named Louis Letrush respawning at the whiterun stables. I reloaded an old save and killed him in the quest which fixed the problem.

Also the quest bug involving a woman named Greta from solitude. Killing Greta ends the bug although you do fail the quest and her delightful daughter ends up hating you forever unfortunately.

It was never my intention to create a psychopathic Nord, but the choice between choosing to put up with a dead-end quest log entity or killing some random person isn't any choice at all.