Eric Jean Baptiste, a former presidential candidate and leader of a political party in Haiti, was assassinated on Friday.
The killing stunned many in a nation already in crisis.
Baptiste was killed in the community of Laboule in the capital of Port-au-Prince along with his bodyguard.
Ricardo Nordain, spokesman for his Rally of Progressive National Democrats, which was founded in 1979 by former President Leslie Manigat, confirmed the killings.
Baptiste also owned one of the biggest lottery companies in Haiti, Pere Eternel.
No one has been arrested.
Prime Minister Ariel Henry said he and others were revolted by the killing.