Suthin was a leader of the People's Democratic Force to Overthrow Thaksinism (Pefot). He led a group of protesters under the People’s Democratic Reform Committee to a polling station at Wat Sri Iam in Bang Na at around 11.30am after learning that booths were still open for advance voting.
He went to negotiate with the director of the polling station who finally agreed to close down operations. Protesters then prepared to leave the station.
After the group had gone only a short distance, they saw more than 50 red-shirt supporters waiting for them, so the protesters tried to avoid them. Gunshots were fired from among the red-shirt supporters and the sound of a bomb was heard.
In the aftermath, Suthin was found to have been shot and three others were injured. They were rushed to a nearby hospital but Suthin was pronounced dead from wounds to the head and neck. The injured protesters are described as being in a stable condition.