Authorities are asking for the public’s help as the search for the Wisconsin graduate student who vanished while walking home after a night out with friends over the weekend enters its fourth day. 

Eliotte Heinz, 22, was last seen walking home from a local bar along the Mississippi River waterfront at around 3:30 a.m. on Sunday, according to the La Crosse Police Department. 

Heinz was enjoying a night out with friends at Broncos Bar when she left around 2:30 a.m. She was seen on surveillance footage walking in the direction of her apartment, which would have been about 30 minutes on foot, around 0.4 miles from the bar. 

“If investigators believe there was an abduction, or if there is evidence the person crossed state lines or was taken across them, federal involvement becomes more likely,” Pack said. “The FBI can be requested by local or state authorities when a case needs additional support or expertise.”

As the search enters its third day, Heinz’s family is asking for their daughter’s safe return. 

“We’re just really letting the police department focus on their job here right now and just trying to get her picture out there,” Amber Heinz said. “That’s what we’re here for. We’re here for Eliotte and keeping our focus on her and getting her home.” 

Anyone with information about Heinz’s whereabouts is asked to call the police non-emergency number at 608-782-7575. 

Information can also be sent anonymously to La Crosse Area Crime Stoppers at 608-784-TIPS or submitted online at https://www.p3tips.com/459.

The La Crosse Police Department did not immediately respond to Fox News Digital’s request for comment.