Shiu was a social worker and activist, and a onetime lecturer and associate director of the Centre for Youth Research and Practice at Hong Kong Baptist University.

He voluntarily reported to police after the trio and Cardinal Joseph Zen had done the same, towards the end of the Occupy event in early December 2014.

[3] On 24 April 2019, Shiu was sentenced to eight months in prison after having been convicted, two weeks earlier, of public nuisance charges in relation to the protests in 2014.

[5] After his release, Shiu was advised by Hong Kong Baptist University in January 2020 to stop teaching pending a disciplinary review, and in late July 2020 that his contract as lecturer would not be renewed beyond August.

Pointing to his excellent evaluations in teaching by students and the department head, Shiu said that the decision had "totally been a matter of political persecution".

[13] Shiu died of stomach cancer at Queen Elizabeth Hospital in Hong Kong, on 10 January 2025, at the age of 55.