Stephanie Jass of Milan wins 4th straight 'Jeopardy!' - with an assist from Ann Arbor

The "Single Jeopardy" round of the show was somewhat competitive on Thursday, ending with Jass holding a slim lead of $5,600 to $4,800 for her nearest competitor.

One of the categories in the round was "Presidential Libraries," and Jass—a history professor at Adrian College—did well with it. When the clue "Ann Arbor, Michigan," came on the screen, she correctly responded that the city houses the library of Gerald Ford—leading Trebek to note, "Good thing you got that one."

Jass pulled away from her fellow contestants in the "Double Jeopardy" round, ending with $24,400 to $12,400 for her second-place challenger.

All three contestants got the "Final Jeopardy" question in the "Nonfiction" category wrong. (With a clue of "In an 1854 work, this title body of water was compared with the proportions of Loch Fyne," the correct response was, "What is Walden Pond?")

But Jass had wisely bet only $1,000, leaving her with $23,400 for the night and a four-day total of $90,170.

Jass' winning run will continue on Friday's episode. "Jeopardy!" airs at 7:30 p.m. on WDIV, channel 4 in Detroit.