Road rage might be Yin's initial claim. The weapon of murder was a big hammer. Can you believe a biology student carries a big hammer in his backpack everyday?
Though, Yin never admited that he killed the korean girl because of jealous or wanted justice,etc, he claimed mental illness which made him fear that the girl intended to hurt him.
Here is a news report after Yin's suicide in 2004:
Murderer in Purdue case found hanged in cell
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MICHIGAN CITY, Ind. — A former Purdue University student convicted of killing two sisters on campus was found hanged in his cell at the Indiana State Prison.
State police are investigating the death of Zhan Yin, 30, of China, whose body was found about 3 a.m. Sunday.
Prison officials say an initial investigation indicates that the hanging occurred at a time when the inmates would have been locked in their cells for the night.
Yin, a former biology doctoral student from China, pleaded guilty but mentally ill two years ago to two counts of murder, burglary and attempted arson in the deaths of the women, who were native to South Korea. Yin was sentenced to life in prison without parole.
Yin told authorities he went to the West Lafayette apartment of Yeunkyung Woo, 31, on Aug. 2, intending to kill her because he believed the biology student meant to do him harm.
When her sister, 29-year-old Hyokyung, of Chicago, answered the door, he hit her in the head with a hammer and stabbed her to death.
He waited inside for Yeunkyung to come home and also killed her with the hammer.
The women's bodies were found the next day.
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