A plumber, Lorenzo Mansutti, was the only person called to give evidence on behalf of the nurse as the defence closed its case on Wednesday.
Letby, 33, denies murdering seven children and attempting to kill 10 others on the neo-natal unit at the Countess of Chester hospital in the year to June 2016.
Mansutti, who has worked as a plumber on the hospital estate since 1986, confirmed Letby’s recollection of an incident she suggested may have contributed to the unexplained deaths of babies.
Giving evidence last month, Letby, 33, said parts of the neonatal unit were “not a safe working environment” because there were “often plumbing issues”.
She told jurors: “We used to have raw sewage coming out of the sinks [and] coming out on the floor in nursery one.”
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Letby, 33, denies murdering seven children and attempting to kill 10 others on the neo-natal unit at the Countess of Chester hospital in the year to June 2016.
Mansutti, who has worked as a plumber on the hospital estate since 1986, confirmed Letby’s recollection of an incident she suggested may have contributed to the unexplained deaths of babies.
Giving evidence last month, Letby, 33, said parts of the neonatal unit were “not a safe working environment” because there were “often plumbing issues”.
She told jurors: “We used to have raw sewage coming out of the sinks [and] coming out on the floor in nursery one.”

Plumber tells Lucy Letby murder trial of drainage problems at hospital
Lorenzo Mansutti gives evidence after nurse said parts of neonatal unit were not a safe working environment