Mr. Ikeri, 27, was a businessman and native of Mbaitoli in Imo State.
Mr. Bartholomew Eziagulu, Chairman of the Union in the province, told the News Agency of Nigeria (NAN) in Durban on Friday that Mr. Ikeri was allegedly tortured to death by the police.
He said the union’s investigations revealed that the police arrested Mr. Ikeri and a friend on suspicion that they were carrying hard drugs.
He said while interrogating him, the police used plastic to cover his face to extort information from him.
“In the process, he suffocated. When the police took him to the hospital, he was confirmed dead,” he said.
Mr. Adetola Olubajo, the Secretary General of the Union, said the national secretariat had been informed about the death of the Nigerian.
He said the body had informed appropriate Nigerian authorities and the police in South Africa.
NAN reports that a senior diplomat from the Nigerian Consulate in Johannesburg had visited Vryheid on a fact-finding mission.
Some members of the union and other Nigerians accompanied the diplomat to the town.
In December 2016, Metropolitan Police in Cape Town had suffocated Victor Nnadi to death, also from Imo State.
A total of 116 Nigerians have been killed in South Africa through extrajudicial means in the last two years, according to the Senior Special Assistant to the President on Foreign Affairs and Diaspora, Mrs. Abike Dabiri-Erewa.
Seven in 10 of the killings were carried out by the South African Police.
The presidential aide disclosed this sometime in February when she met with the South African High Commissioner to Nigeria, Lulu Louis Mnguni in Abuja.