Colin McSweeny, formerly of Thornton Heath, murdered his 24-year-old son Shaun in November 2014.
He killed Shaun with a scaffolding pole after being “devastated” to learn he planned to move out of family home with his five-year-old daughter, a jury was told.
He then left the 24-year-old’s body while he spent the evening with a police officer friend just metres away in their living room.
Later that night McSweeny tried to dump his adopted son’s body in the River Thames at Deptford Wharf but was spotted and arrested.
He was found with his son’s body wrapped in a tarpaulin in the boot of his car.
McSweeny was found guilty of murder at the Old Bailey in 2015 and was jailed for life with a minimum term of 14-and-a-half years.
The Prisons and Probations Ombudsman said McSweeny died at HMP Gartree in Leicestershire on September 23 2024.
An investigation is ongoing into the cause of his death and any concerns about the prison’s handling of the case.