The CEO of South Africa's biggest energy company, Eskom, was poisoned in December, the firm said.
Numerous reports say CEO Andre De Ruyter had cyanide slipped into his coffee at the company's HQ.
After drinking the coffee, De Ruyter became "weak, dizzy, and confused," EE Business Intelligence reported, citing an unnamed source.
"This attempt on his life will be thoroughly investigated and those responsible must be charged," Pravin Gordhan, the government minister overseeing South Africa's energy sector told the Financial Times.
Since taking over as CEO of Eskom, De Ruyter has attempted to crack down on corruption within South Africa's energy sector, EE Business Intelligence reported.