"One person was killed instantly, another opposition supporter was hospitalised and several others had minor injuries," a local police officer, who declined to be named, told AFP by telephone.
Sri Lankan elections have been marred in the past by violence but Tuesday's shooting, near the town of Hungama in the south of the island, was the first fatality in the run-up to the vote.
The US embassy in Colombo said it was "deeply concerned" over the killing and escalating violence in the run-up to the January 26 presidential election and urged the authorities to ensure a free and fair poll.
In a statement it said it hoped the "election is conducted freely, fairly and without violence.
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"We urge the appropriate authorities to conduct a full investigation of this and other acts of violence and to protect th