Detectives from the Homicide and Major Crime Command (HMCC) have launched an investigation following the death of a man in Hackney.
Police were called at about 08:16hrs on Sunday, 18 March, to reports of a person found with stab wounds on Towpath Walk, E9.
Officers and London Ambulance Service attended the scene.
A man, aged 37, was found with multiple injuries and was pronounced dead at the scene at 08:45hrs.
Officers believe they know the identity of the deceased and police are in the process of informing his next of kin.
A post-mortem examination will be scheduled in due course.
A 30-year-old man [A] was arrested on suspicion of murder and taken to a north London police station; he has since been released under investigation.
Detective Inspector John Marriott of the HMCC leads the investigation and said:
"Our initial enquiries have established that an altercation has taken place involving the victim and the suspect who had both attended a private party at the location.
"It is thought an initial dispute has started inside the party but this has spilled on to the towpath by the River Lea where the victim has been stabbed."
Any witnesses or anyone with any information is asked to call the incident room on 020 8345 3715 or contact via Twitter @MetCC.
To give information anonymously contact Crimestoppers on 0800 555 111 or online at crimestoppers-uk.org.