Police have arrested a man who allegedly killed his supplier during an argument over cash refund for a sour packet of milk in Mathare. [Photo/depositphotos.com]

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Police in Nairobi have arrested a milk vendor on allegations of killing a supplier after a disagreement.

Henry Gitonga was nabbed in connection with the death of Moffat Kwomboki in Mathare on Monday.

Police say Gitonga killed Moffat during an argument over a cash refund for a sour packet of milk delivered to his kiosk by his regular supplier.

An officer attached to Muthaiga Police Station told The Standard that Gitonga allegedly picked a knife from his kiosk and stabbed the deceased in the chest three times, killing him instantly.

"A witness informed us that the vendor had complained to the supplier that one packet of milk that he had delivered was sour and demanded a refund. However, the two could not agree and started arguing, prompting to the vendor pulling a knife and killing his supplier," the officer said.

Police have detained the suspect as they further probe the incident before he is arraigned in court.