The judge overseeing Oscar Pistorius's murder trial has adjourned the case for more than a week - just before the star Paralympian was expected to take the stand for the first time - because a senior court official was sick.
"One of my assessors is not well," said Judge Thokozile Masipa.
"I suggest that we postpone this matter to the 7th of April."
Pistorius was expected to be called as a witness for the defence and later to face fierce cross-examination about how and why he killed his girlfriend Reeva Steenkamp on Valentine's Day a year ago.
The "Blade Runner" sprinter denies a charge of murder, saying he mistook the model for an intruder.
Judge Masipa had been appointed two court assessors to help her decision in the high profile case, which has also seen South Africa's justice system put in the dock amid allegations of police bungling.
Amid reports the assessor, advocate Janette Henzen Du Toit, has been hospitalised, a criminal lawyer said the case could continue if she were unable to return.
But if Judge Masipa appoints a replacement the trial could start over, according to criminal lawyer William Booth.
"I don't believe you can have an assessor joining the case midstream," said Booth, who is not related to the trial.
The case was originally scheduled to run for three weeks until March 21, but is now slated to run until at least mid-May.
Pistorius is the only surviving witness to the events inside his house in the early hours of February 14, 2013, so his testimony is likely to be key.
The 27-year-old has to explain why he fired four shots at the model and aspiring television actress through a locked toilet door, and undermine prosecutors' argument that her death was premeditated murder.
It will be the first time he speaks in public since the Valentine's Day killing, besides pleading "not guilty, milady", and the occasional "yes, milady" to Judge Thokozile Masipa during his trial.
Defence lawyer Barry Roux has read two almost identical affidavits on behalf of his client - one at his bail hearing last year, another at the start of the trial on March 3.
Pistorius does not have to testify, but his defence team has indicated it believes it will be in his interest to explain the night's events.
If the accused does take the stand, law dictates he has to be the defence's first witness.
"I think it's going to be a very tough time for Pistorius. Every person who testifies in court goes through pressure, especially the accused," said Cape Town-based lawyer Booth.
"Every word could count against you."
Pistorius's lawyers would want him to face prosecutor Gerrie Nel's cross-examination for as little time as possible, but he could spend as much as two days on the stand.
On Tuesday the state called the last of its 21 witnesses against the athletics star.
The double amputee, who was born without calf bones and garnered worldwide fame by running on two carbon fibre blades, earning him the "Blade Runner" monicker, says he shot Steenkamp because he mistook her for an intruder.
Defence lawyers say the pair were deeply in love, and that most of their mobile phone correspondence was affectionate, despite one message in which Steenkamp said she was sometimes afraid of Pistorius.
If found guilty of premeditated murder he faces life in prison.
But even under his version of events the Paralympian could be convicted of the lesser charge of manslaughter, which can also mean a heavy prison sentence.
