Liu grew up in the western suburb. She was going to be a software engineer for Microsoft. Now her twin sister and father are back from Germany after arranging for her body to be returned.
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Liu's friend, 22-year-old Kelsey Chang has just been released from the hospital. The two recently graduated from the University of Illinois in May.
They were visiting a famous castle in Germany last week, when investigators said a 30-year-old man from Michigan lured them onto a hidden trail and pushed them into a ravine.
Chang fell 165 feet down a steep slope, but survived after being caught by a tree. Liu died at the hospital.
"Eva Liu represented the best of our community. She was a vibrant, intelligent, kind young woman with a bright future," said Naperville Mayor Scott Wehrli.
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The suspect is now being held on suspicion of murder, attempted murder and attempted sexual assault. He arrived back in the U.S. overnight under heavy police protection.
Donna, a neighbor of the Michigan man, arrested in this attack.
"I'm in shock, mainly because they appear to be a really nice family you know, courteous, friendly, shovels my snow in the winter," she said.
Liu's family is asking for privacy while trying to make unexpected funeral arrangements.