He was 75 years old.
One fan, Aluda Franklin said: "When you visit Tanzania, during Story time, they will not fail to mention Reginald Mengi with admiration. He is a very rich man but always helping the poor."
Adding, "He is selfless, he has built hospitals he has time for people and he is spoken of with love and admiration. Today he rests, I hope many more will flow his footsteps. Go well mkuu."
Magufuli paid tribute in a post.
https://twitter.com/MagufuliJP/status/1123809850096537600
Fans have taken to twitter to send their condolences to the family and pay tribute to Mengi.
https://twitter.com/itsagneskagure/status/1123829067378233344
https://twitter.com/SerengetiBytes/status/1123817324346318849
https://twitter.com/BenjaminWamara/status/1123813025386061825
https://twitter.com/ItsMutai/status/1123807461117505544
https://twitter.com/NdegeSerikal/status/1123820475887640576
https://twitter.com/DonaldBKipkorir/status/1123808838233272320
https://twitter.com/VictorMochere/status/1123818842495516677