The parents of Idaho student murder suspect Bryan Kohberger have been subpoenaed to testify before an investigative grand jury in the family’s home state of Pennsylvania, says a report. Mr Kohberger’s father is expected to testify before the grand jury in a sealed proceeding in Monroe County on Thursday, a source told CNN. It was not immediately clear in what potential crime they were being investigated. His mother has already given evidence to the grand jury, the source told the news outlet and added that their testimony, which will be given under oath, may be shared with Idaho prosecutors. Meanwhile, the families of two of the slain University of Idaho students are preparing to sue the university, Washington State University and the city of Moscow over their murders, it has been revealed. It comes after their accused killer Mr Kohberger appeared in court for his arraignment in Latah County Court in Moscow, Idaho, on Monday. Mr Kohberger is accused of killing Goncalves, Mogen, Xana Kernodle, 20, and Ethan Chapin, 20, on 13 November in a horror attack that rocked the college town of Moscow and sent shockwaves across America. Read More Bryan Kohberger’s sister searched his car for evidence before police swooped in There was a glaring mistake at the Idaho murders hearing Bryan Kohberger allegedly broke into female student’s home and spied on her months before Idaho murders Who is Bryan Kohberger? The criminology graduate being arraigned over the Idaho college murders