Hilmioglu, who has been diagnosed with stage-three liver cancer, was arrested in April 2009. The Ergenekon group was offcially accused by Turkey's government of organizing a military coup in 2013.
Hilmioglu’s lawyers filed an individual application to the Constitutional Court for his release on January 16, claiming a breach of his human rights, health and a violation of his right to a fair trial. On Wednesday, the Constitutional Court discussed Hilmioglu’s health report and released him on grounds of his illness.
Hilmioglu, was sentenced to 23 years in prison for his alleged involvement in the Ergenekon group's plot to topple the government in 2007.