Sahwan was serving a 15-year prison verdict on charges of being involved with what's known as the "Qatar Cell".
Angry mourners shouted slogans against the Bahraini King Hamad bin Isa Al Khalifa, whom they deem responsible for violations in Bahraini prisons. Mourners clashed with regime forces, which attacked the crowd with teargas canisters.
Sahwan was arrested on November 2011, and he remained under the prison's medical neglect despite having 80 shrapnel in his head, as a result of shotgun bullets fired by forces in Sanabis protests in April 2011.
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