CHICAGO (WBBM Newsradio) — Eighteen-year-old Alex Vue went to class at James Madison Academic Campus in Milwaukee on Monday, left at lunch and hasn’t been seen or heard from since.

“My husband went to the office to see if he was in class and they said he was actually absent since lunch, so that’s the last anybody saw or heard from him,” says Khou Xiong, Vue’s aunt.

Police say when they searched bus and train stations they discovered the high school senior bought a one-way Amtrak ticket to Chicago.

“I have no idea why he would go to Chicago. We have no friends or relatives there,” the aunt says.

Vue left his cellphone behind, there’s been no activity on social media and she says he has no access to cash.

“He doesn’t have any credit cards so we don’t know what is going on.”

Vue has a tragic past. He was in his family’s apartment when his parents were murdered by a neighbor in March 2016. Vue and his three siblings have been living with other relatives since the murders.

Alex Vue’s missing person flyer (Photo provided to WBBM)

Dan J. Popp, 39, was convicted of three counts of first-degree homicide for the murders of Jesus Manso-Perez, 40, Mai Vue, 32, and Phia Vue, 36, in their apartment building on Milwaukee’s south side.

On Friday, the Vue family was there as Popp was ruled mentally ill during a court hearing. Popp will be sentenced February 23rd.

Xiong worries the hearing may have taken an emotional toll on her nephew.

“He was there and after court we went to dinner and he was talking about school and video games. He showed no signs of anger or distress or suicide, but he never talks about what happened to his parents,” the relative says.

“Maybe he just needed time to himself, but it’s unlike him to take off for this long. He’s never even been away overnight. It’s unlike him to not have his cell phone or try to find a way to get a hold of us. It’s very unusual. We are very worried.”

Xiong says Vue has been applying to colleges and has “no reason to disappear in the middle of high school.”

If you have seen Vue or know his whereabouts, you’re urged to call Chicago Police or Milwaukee police.