Northern Cape man jailed for killing neighbour after dispute over broken window

A Northern Cape man has been sentenced to 12 years’ imprisonment in the Springbok Regional Court for the murder of his 18-year-old neighbour. 

Aylward van der Byl, 30, stabbed his teenage neighbour Marshall Perciville Sieplieon after an argument over a broken window. 

Van der Byl pleaded guilty to malicious injury to property, murder and assault arising from incidents that occurred in Buffelsrivier, near Springbok, on March 13 and 14, 2026.

The court heard that van der Byl, the deceased, and the complainant, who is the deceased’s sister, were neighbours in Buffelsrivier.

The altercation

On the evening of March 13, 2026, an argument arose between Van der Byl and the deceased after the deceased walked through van der Byl’s yard, as he had routinely done in the past.

Van der Byl, who had been consuming alcohol with friends, told the deceased not to walk through his yard. He subsequently threw a stone at a window of the complainant’s house, breaking it. The complainant reprimanded him and asked him to stop because her young children were inside the house. She and the deceased then went inside to avoid further confrontation.

The following morning, van der Byl saw the deceased sitting near an outside toilet and asked him whether he still felt the same way as he had the previous evening. The deceased responded that Van der Byl should repair the broken window.

Angered by the response, van der Byl entered his house, armed himself with a knife and approached the deceased. The deceased picked up a plank in an attempt to defend himself, but van der Byl stabbed him once in the upper chest.

The deceased struck van der Byl with the plank and attempted to flee while clutching his chest. He collapsed shortly afterwards and died at the scene. Van der Byl also slapped the sister through her face when she confronted him.  Bystanders intervened and stopped the assault.

Police arrived at approximately 8.50am, and van der Byl was arrested the same day. The knife used in the stabbing was confiscated.

A post-mortem examination established that the stab wound penetrated the deceased’s chest cavity and caused severe injuries to his lung and heart, resulting in extensive internal bleeding and his death.

Plea explanation

In his plea explanation, van der Byl admitted that he stabbed the deceased because he was angry. He conceded that he had not acted in self-defence and that his life had not been in danger.

Although he denied having a direct intention to kill the deceased, he admitted that he knew stabbing a person in the chest or upper body could be fatal but proceeded with the attack. He further acknowledged that his conduct was unlawful and punishable by law.

In determining an appropriate sentence, the court found that substantial and compelling circumstances existed to justify a deviation from the prescribed minimum sentence of 15 years’ direct imprisonment for murder. These included van der Byl’s admission of wrongdoing and the deceased’s family’s acceptance of the proposed sentence.

The court sentenced him to six months’ imprisonment for malicious injury to property, 15 years’ imprisonment for murder, of which three years were suspended for five years on condition that he is not convicted of murder, attempted murder, assault with intent to cause grievous bodily harm or assault during the period of suspension, and six months’ imprisonment for assault.

The sentences for malicious injury to property and assault were ordered to run concurrently with the sentence for murder, resulting in an effective sentence of 12 years’ imprisonment. 

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