UPDATE: Henri van Breda expected to apply for bail

The 21-year-old is accused of hacking to death his parents & brother, while his sister survived the attack.

FILE: Henri van Breda. Picture: Facebook.com

CAPE TOWN - Henri van Breda faces three murder charges and one of attempted murder after a 17-month investigation into the De Zalze axe murders.

He is expected to apply for bail during a brief court appearance this morning.

The 21-year-old is accused of hacking to death his parents, Martin and Teresa van Breda, and his older brother Rudi in their De Zalze home in January last year.

His 17-year-old sister, Marli was seriously wounded.

After almost a year and a half of unanswered questions, investigators have finally arrested a suspect in connection with the family's murder.

The National Prosecuting Authority (NPA) had been in possession of the murder docket for several months.

It's not yet clear what evidence the state has against the 21-year-old, who handed himself over at the Stellenbosch Police Station yesterday.

WATCH: Henri van Breda hands himself over.

His sister, Marli, has been making a steady recovery from severe head wounds, but she has suffered from retrograde amnesia - it's not known if she can remember details of the night her parents and brother were murdered.