The public inquiry into Mid Staffordshire NHS Foundation Trust is being adjourned due to medical reasons.
Inquiry chairman Robert Francis has said he needs a medical procedure which will take place in July.
The inquiry, which opened in November 2010, will be adjourned on 7 July and not resume until September.
It is looking into monitoring by regulatory bodies after a higher-than-expected number of deaths occurred between 2005 and 2008.
Mr Francis said he had spoken to health secretary Andrew Lansley to inform him of the decision.