The Judge presiding over the sentencing of Chris Denning has described the former Radio 1 DJ's actions as "inappropriate and depraved."
Judge Alistair McCreath addressed Denning directly in court as he sentenced him to 13 years in prison for sexually assaulting 24 boys.
He said: "It is not to be forgotten that all of this suffering was inflicted by you without thought for anything other than your own selfish pleasure."
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Harry will also pay tribute to a British soldier killed by an elephant during anti-poaching operations in Malawi.
The family are making an official visit to South Africa.
The duke, who has admitted “I feel more myself in Africa”, is about to begin a tour of South Africa with the duchess and Archie.