Dr Moses Kargbo, who had been a retired medical officer in the Ministry of Health, died today at the Hastings Ebola Treatment Center east of the capital, Freetown, where he had been receiving treatment.
He had been volunteering to help fight the spread of the virus at a government hospital in the central Tonkolili district.
Kargbo's death was confirmed by Dr Amara Jambai of the Health Ministry.
It comes a day after that of Dr Martin Salia, a surgeon who contracted Ebola in Sierra Leone and was transported to a Nebraska hospital over the weekend for aggressive treatment.