Botha, who was born in Rustenburg on 13 November 1935, represented the erstwhile Transvaal (now the Lions) and Western Province at provincial level between 1958 and 1971. He played two Tests and eight tour matches for the Springboks in 1965.
He made the move from the former Transvaal to Western Province in 1962 along with Tiny Naude, and both joined Hamiltons, with Botha making the step-up to Western Province that year as well.
Botha returned to Transvaal where he played 93 times between 1957 and 1972, before being selected for the 1965 Springbok tour to Australasia.
“Piet was described as a big man with a small heart who loved his family and loved the game of rugby,” said Mr Alexander.
“He probably would have played in more Tests, but unfortunately, during the tour in 1965, he dislocated his shoulder in New Zealand and never regained proper fitness.
“Our thoughts and condolences are with his wife Annette, their family and loved ones during this time of bereavement – may you find solace in the memories of a wonderful rugby man and individual.”