A Thai gunman has been sentenced to life in prison for the murder of a Cambodian opposition politician in Bangkok, with the former MP's widow left questioning who ordered the killing.

French national Lim Kimya, a former opposition parliamentarian in Cambodia, was shot dead on January 7 by Ekkalak Paenoi as the ex-MP arrived in the Thai capital with his wife.

Cambodian opposition figures have accused the country's powerful former leader Hun Sen of ordering the shooting, and Lim Kimya's widow called this week for a full accounting of who was behind it.

Ekkalak faced a potential death sentence in Thailand for premeditated murder, but a judge said on Friday that the Bangkok court reduced his sentence to life imprisonment since he confessed.

The Thai man was arrested in neighbouring Cambodi

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