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A 63-year-old has been quizzed by police over the death of his son.
Detectives from the Kent and Essex Serious Crime Directorate have been called in following an incident in Dartford.
The 27-year-old is said to have suffered a fatal stab wound at a property in Darenth Hill on Tuesday.
Officers were called to the scene at 10.45pm to reports someone had been seriously injured,
The older man, who is also from the town, 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 has since been released on bail, pending further inquiries, until June 25.
KentOnline understands the men were father and son, but police would not confirm this, only saying they "were known to each other".
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