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A 63-year-old remains under investigation in connection with the death of his son in Dartford.
Detectives were called to a property in Darenth Hill last month after a 27-year-old is said to have suffered a fatal stab wound.
Officers were called to the scene at 10.45pm on May 26 and an older man, also from the area, was arrested some hours later on suspicion of murder.
However, a post-mortem examination could not conclusively say the fatal wound was down to a third party and investigations continue to work out what happened.
The man was released on bail, pending further inquiries, but this has since been extended until August 28.
KentOnline understands the men were father and son, but police would not confirm this, only saying they "were known to each other".
The investigation continues.
Anyone with information can call Kent Police on 01474 366149 quoting reference 26-1779. You can also call the independent charity Crimestoppers anonymously on 0800 555111 or complete the online form at www.crimestoppers-uk.org