Mandla Jiyane, 25, is reported to have fallen last weekend from the Flora shopping mall in Prague.
The Zululand Gospel choir member went to the country with the group two years ago and had returned to pursue a music career.
His family in Nseleni, near Richards Bay, were told of the death by his Czech partner, Lucie Kostelecka, who is also a musician.
Kostelecka said Jiyane had gone with a colleague to watch a movie at the cinema. “No one bothered to contact me, I had to find out on my own. Police told me they had footage showing he jumped, which I don’t believe. There was no reason for him to commit suicide, he had no problems and had just found a job,” said the 37-year-old woman.