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Rebecca Kasper, ASU student, found murdered in bathtub; boyfriend charged

Luis Soltero, left, and Rebecca Kasper in an undated personal photo. Facebook

(CBS) TEMPE, Ariz. -The boyfriend of Rebecca Kasper, a 19-year-old Arizona State University student found brutally murdered in a bathtub Tuesday, has been arrested and charged in connection with her death, CBS affiliate KPHO reports.

PICTURES: ASU student allegedly murdered by boyfriend

Kasper, a junior marketing major from Minnesota, was found in the bathtub of a Tempe, Ariz. apartment Tuesday wrapped in a yoga mat and blanket, her head covered with a plastic bag and her face beaten beyond recognition, police say, according to the station.

Luis Soltero, 22, of Tempe, was arrested in connection with Kasper's death.

Soltero, who told police he was Kasper's boyfriend, was booked into jail on a charge of first-degree premeditated murder after reporting Kasper's death to police, according to court documents.

Soltero voluntarily went to Tempe police and told them that his girlfriend was at the apartment.

"...She is dead and I am not going to tell you anything more without an attorney," Soltero said, according to the documents obtained by KPHO.

Kasper's body was reportedly already in a state of decomposition when police found her. The court documents say her body was sprinkled with coffee grounds and baking soda, her wrists were handcuffed and her ankles were bound by clear plastic tape.

A dumbbell covered in blood was found near the bathtub and blood was splattered on the walls and floor of the bathroom, according to the documents.

Police said they learned that Soltero and Kasper had recently broken off a relationship and that a handwritten note listing the "pros" and "cons" of  "breaking up with Becky" was found in the apartment, the station reports.

At the time of Kasper's death the two were still reportedly seeing each other.

Another note found at the scene reportedly stated Kasper was killed "because I had to end her life. I did not treat her right. She deserved better but never accepted it. So I had to make the choice for her."

Soltero was being held on $1 million bond.