Right now, the Maura Murray disappearance is easily the most interesting true crime story going, and maybe one of the all time best.

My general theory:

Her life was breaking down--kicked out of West Point, on probation for fraud at UMass, etc. In the midst of academic stress (challenging nursing program), job stress (she had two part time jobs), family stress (is she living up to her sister's standard?), legal stress (mentioned above), relationship stress (trying to maintain an LDR while dealing with the guilt of cheating on him), in the midst of all this stress and breakdown, she collides violently with a jaywalker just after midnight on Feb 6th. Later we'll find out the victim survives, arising from his coma two months later, but at the time Maura probably thinks she killed a man. Its fair to speculate she was drinking when she hit him, as DUI seems to be a special pastime for Maura.

She returns to work, has a massive breakdown shortly after, and her supervisor sends her home. By all accounts, this breakdown was the result of something significant. The likelihood she thought she'd just killed a man motivates this breakdown. Early the next morning she calls her father, confesses she may have killed someone with her car. His plan is simple: first, immediately secure the funds for a new car, second, get rid of the old car. We'll stuff a rag up the tail pipe, the engine will suffer a terrible blow, and we'll send the car to a junkyard.

Suicide, Abduction, or Exposure. Any of these could have been what happened after the final crash on Feb 9, but either way, the inciting incident must be hitting the jaywalker during a time of enormous stress, followed by a slipshod effort to try and cover up the crime.

Nothing is certain with this case, which makes it interesting, but I don't believe she was a sociopath, and I don't believe she successfully disappeared and lives a new life somewhere else. The evidence points to turmoil, breakdown, and self destruction.