More remains believed to belong to Sade Robinson, a 19-year-old college student who went missing earlier this month, washed up on a Lake Michigan beach in Wisconsin, the Milwaukee County Sheriff's Office said.

An arm and torso were found around 7:37 a.m. Thursday on a tree-lined beach by a person taking a walk in the area.

Other parts of Sade Robinson's body were found at a park next to Lake Michigan and in Milwaukee earlier this month.

Robinson, a student at Milwaukee Area Technical College, was last seen on April 1 when she went on a first date with Maxwell Anderson.

She was reported missing the next day, and law enforcement authorities discovered some of her remains and her car that had been set ablaze.

Anderson, 33, was arrested last week and accused of killing Robinson, dismembering her body and setting fire to her car "in an attempt to obscure potential evidence of the killing," the sheriff's office said.

Anderson has been charged with first-degree intentional homicide, mutilating a corpse and arson.

Robinson's mother, Sheena Scarbrough, said they are living through an "ongoing nightmare."

"It's horrible," she told the Milwaukee Journal Sentinel. "It's excruciatingly painful every day."

Anderson is being held in the Milwaukee County Jail on $5 million bail. His next court appearance is scheduled for Monday.

Steven Anderson, his father, released a statement on Thursday expressing "our deepest sympathy and heartfelt condolences" to Robinson's loved ones, CNN reported.

"To Sade's mother and father, words cannot express our sorrow for the incomprehensible pain and grief you are going through. We join the entire community in celebrating Sade's life," the father continued.