He described the act as gruesome and cruel.
Simeon hailed from Okposi in Ohaozara LG of Ebonyi.
Umahi called for full investigation into the killing which occurred at Verona Street, Johannesburg.
A statement signed by his Chief Press Secretary, Emmanuel Uzor, also urged the South African High Commissioner in Nigeria, to “probe the circumstances surrounding the incident.”
The Nigerian Citizens Association in South Africa confirmed the death on Saturday.
In a statement by the spokesperson, Mr Sunny-Wenike Dougla, 43-year-old until his death was a Taxify driver.
The victim was said to have been killed after dropping off his clients in a part of the city.
Douglas added that an investigating officer with the South Africa Police Service confirmed that a case of murder had been opened on the matter.
He vowed that his association would follow up with the case to ensure that the killers were arrested and brought to justice.
The killing happened two weeks after a Nigerian teenager suffered a similar fate in the country.
