Forensic Investigators: Matthew De Gruchy
Friday 15 February 6:00PM HK/SIN/MAL 5:00PM Thai/WIB
Saturday 16 February 4:00AM HK/SIN/MAL 3:00AM Thai/WIB
Monday 18 February 7:00AM HK/SIN/MAL 6:00AM Thai/WIB
Tuesday 02 April 6:00PM HK/SIN/MAL 5:00PM Thai/WIB
Wednesday 03 April 7:00AM HK/SIN/MAL 6:00AM Thai/WIB
Thursday 16 May 6:00PM HK/SIN/MAL 5:00PM Thai/WIB
Friday 17 May 12:00AM HK/SIN/MAL 11:00AM Thai/WIB
Friday 17 May 7:00AM HK/SIN/MAL 6:00AM Thai/WIB
Saturday 18 May 4:00AM HK/SIN/MAL 3:00AM Thai/WIB
Saturday 12 October 11:00PM HK/SIN/MAL 10:00PM Thai/WIB
Sunday 13 October 6:00AM HK/SIN/MAL 5:00AM Thai/WIB
Sunday 13 October 1:00PM HK/SIN/MAL 12:00PM Thai/WIB
Sunday 13 October 6:00PM HK/SIN/MAL 5:00PM Thai/WIB
A mother and her two children were found in their house brutally bashed to death. Was it a robbery gone wrong, or something far more sinister?
Bruising on the body showed the murder weapon to be similar to something like a wheel brace. When detectives and crime scene examiners searched the house they found items such as the VCR had gone, but so had a small section of carpet from the main bedroom floor.
The prints and DNA of the surviving son, who had an alibi for the night of the murder, were found at the scene – on a jerry can full of petrol. One of the victims had been doused in petrol. But why would he kill his mother and siblings? There was no motive.
As the investigation continued items from the house, including the missing carpet, were found in a dam some kilometres away from the murder scene. A discarded torn up note, also found at the dam, was pieced together and the handwriting analysed. Detectives and crime scene examiners also searched the family cars. The wheelbrace from the mother's Toyota was missing, but there was a tiny tuft of carpet found in the boot.
The note looked like a "how to commit a murder" list, and the author was the surviving son. The carpet found in the dam matched the carpet taken from the bedroom. The tuft of carpet found in the mother's car matched the carpet from the dam and that of the bedroom. Microscopically, the tuft, too, had blood on it. The DNA matched that of the surviving son.
In addition, the manufacturer of the Toyota car produced a wheel brace that would have come with the vehicle when bought. Its design exactly fitted the bruising on the brother and sister.
Matthew De Gruchy was sentenced to 28 years imprisonment for the murders of his mother, sister and brother. Why he did it remains a mystery.