The Angelika Kluk murder trial has been stalled after the man accused of raping and killing her became unwell.
Mr Tobin denies raping and murdering Angelika Kluk
The trial of Peter Tobin, 60, had been due to resume at the High Court in Edinburgh at 1000 BST.
But when jurors finally took their seats two hours later, they were told by Judge Lord Menzies that the accused had taken ill.
Lord Menzies instructed the jury to return to court on Friday morning. Mr Tobin denies all charges against him.
Mr Tobin was transferred in an ambulance from the court building to the city's Royal Infirmary.
The vehicle was accompanied by another in which a member of Mr Tobin's legal team was a passenger.
Hospital officials confirmed that Mr Tobin was now a patient. A spokesman for NHS Lothian said he had been admitted for observation.
The judge had earlier apologised to the jury of eight women and seven men for keeping them waiting, and said it was "clear" the court would not be able to sit again until Friday at the earliest.
He told them: "It is simply that it appears the accused has been taken ill, is unwell, and investigations are ongoing at the moment as to what may be the problem and those investigations are not going to be concluded in the course of today.
"I could have sent you away earlier this morning but it wasn't clear at that stage how long the investigations would take. It is now clear we are not going to get any business done today."
Polish student Angelika, 23, had been staying at the chapel house attached to St Patrick's Church in Anderston, Glasgow, and working as a cleaner to help finance her language studies in Gdansk. Mr Tobin was helping out at the church as an odd job man.
The murder charge alleges that Mr Tobin attacked Angelika between 24 September and 29 September in St Patrick's Church, or elsewhere, gagging her with cloth and tape, tying her hands, raping her, battering her with a piece of wood or something similar, and repeatedly stabbing her with a knife.
It is alleged that he then hid the body under the floor of the church in an attempt to defeat the ends of justice.
In a special defence read to the jury Mr Tobin admits having sex with the Polish student, with her consent.
A further charge - which Mr Tobin also denies - alleges that he told Glasgow police his name was Patrick McLaughlin, gave a false date of birth and address, and that he travelled to London and gave staff at the National Neurology and Neurosurgery Hospital in Queen's Square, London, another false name.
Mr Tobin also denies a breach of the peace between July and September last year by threatening Russian student Rebecca Dordi at St Patrick's Church.