The man charged with the murder of Det. Garda Colm Horkan was declared unfit to appear in court via video link for a fifth time.

Stephen Silver of Aughaward, Foxford, Co Mayo, is charged with the murder of Det. Garda Horkan in Castlerea on June 17th, and was due to appear before the court by video link earlier today.

The extent of the investigation into the murder of Det. Garda Colm Horkan involves 200 statements and 250 exhibits, a court has been told.

The file into the murder also includes 70 CCTV exhibits and the content of ten electronic devices, while Gardai are also speaking to a person in Australia as part of their investigation.

Details of the investigation were outlined at Harristown District Court in Castlerea by Sgt Paddy McGirl, who said he was confident the book of evidence would be completed within two weeks.

But defence solicitor Marina Moran of Gearoid Geraghty & Company said that the defendant was still receiving treatment at the Central Mental Hospital.

It is the fifth time that the 43-year old has been deemed unfit to appear by video link at Harristown District Court in Roscommon.

Sgt McGirl told Judge Deirdre Gearty that the investigation is ongoing and also complete.

His application for Silver to be remanded in custody to appear before Harristown District Court by video link on September 4 was granted by Judge Gearty.