Meghan Markle undertook a surprise engagement in London via video link today at Mayhew Animal Home.
The Duchess of Sussex, who quit royal duties four years ago, virtually opened a new wing of an animal charity named in honour of her late friend, Oli Juste.
The virtual visit made was announced on the Duke and Duchess of Sussex's new website, Sussex.com.
Meghan, 42, also published a statement on her website announcing that the new wing had been named after Juste.
Meghan Markle appeared on a video link in London today
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Meghan met dog trainer Juste in 2019, just three years before he died in January 2022.
In January 2019, the former working royal became patron of The Mayhew, the animal shelter based in London.
In the video message watched by Juste's friends and family, Meghan said: "A heartfelt thank you to the wonderful team at Mayhew who have worked tirelessly to bring this dream to life.
"It was so important to find a way to celebrate Oli's memory in a manner that he would have loved.
Meghan Markle visiting Mayhew in 2019
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"Mayhew is a beacon of hope for those in need and a shining example of what can be achieved when we work together."
The Duchess of Sussex emotionally told how Juste's death in January 2022 left her heartbroken.
Juste's friends and family gathered at The Mayhew in north-west London, where the Oli Juste wing was unveiled in his name.
The Mayhew was understood to be Meghan's favourite animal charity, having held the role of patron in a private capacity after being introduced to it by Juste.
Meghan Markle was pregnant with Prince Archie during the outing
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She stepped down from the role in 2022, two years after she and Prince Harry moved to California.
A statement on Sussex.com recounted the duchess's bond with Juste, saying: "They shared many things throughout their friendship, among which was a deep commitment to animal welfare and a love of rescue dogs.
"The Oli Juste Wing is a testament to his unwavering love and commitment to our furry friends, and will improve the lives of countless animals, reminding us all of the power of compassion, connection, and care."
Meghan wrote in 2022 that she was left "heartbroken" by Juste's death.