Homicide detectives have arrested a man on suspicion of the murder of Jack Hague in Tower Hamlets.
The 24-year-old was detained after attending an east London police station.
A murder investigation was launched after police were scrambled to a fight in Corfield Street at around 8.20pm on Sunday.
Mr Hague, 38, was pronounced dead at the scene after suffering a stab wound.
A post-mortem examination will take place in due course.
In a tribute, his mother said: “His smile was amazing - he was loving, funny, giving of his time and loved being Uncle Jack to his niece and two nephews best of all.
“He is my son, my blue-eyed boy and will live in me until the day I die.”
Anyone with information or footage is asked to call police via 101 quoting reference CAD 6482/05May. To remain anonymous call Crimestoppers on 0800 555 111.
