“It’s a dichotomy, because I’m used to having people coming and going and creaking around upstairs,” he said. “(Now) it’s been about two weeks of quiet except for people coming to the door.”

Lueth attended a lab at MSU until 5 p.m. Nov. 11, horticulture professor Art Cameron said. They scheduled a meeting for the following day, but she never showed up.

Investigators from the Michigan State Police searched Lueth’s apartment Wednesday and Thursday. They were looking for hints about where Lueth could be, State Police Sgt. John Faccio said.

“They were looking for clues as to where she may be, to find a sign where maybe she had written a note saying where she was going — just anything like that,” he said.

Police are investigating the incident as a missing person case, but are not ruling out foul play, Faccio said.

“Anytime there’s a missing person complaint we take it seriously. We always investigate it one way until the outcome goes another way,” he said.

Lueth had recently broken up with her boyfriend, who moved out of the apartment they shared between Nov. 6 and 11.

Police have spoken with the ex-boyfriend at least twice since Lueth disappeared, Faccio said. Faccio could not comment on whether he was cooperative in the interviews.

Her friends have been checking at restaurants and bars in the area to see if anyone has seen her, and her father, Roy Lueth, also has been searching for clues to his daughter’s whereabouts.