The wife of the young father stabbed to death at a West Croydon bus stop spoke of her sadness over the killing.
She told a welfare officer at the Ghanaian High Commission that she is consumed with grief over her dead partner and her now fatherless newborn baby.
Martin Quansah, welfare officer at the Commission said: “She sounded the lowest that you can imagine a human being sounding. She was completely down and flat.”
A 22 year old man continues to be questioned by detectives following the fatal stabbing at 6.15pm on Thursday night outside the Lidl supermarket.
The man, whose partner had given birth that morning, was on the way to the Mayday hospital with his three year old daughter when he was killed.
The young girl is expected to be interviewed by specialist police officers.
A post-mortem examination revealed the victim, who was originally from Ghana, died of a single stab wound to the heart.
Security guards at a nearby office described how they took the girl away.
One staff member said: “I said she shouldn't be watching something like that, I asked around to see whose child she was and somebody said she was the victim's, so I took her away into our building.”
He said that the three-year-old was “in shock, her eyes were wide open”. She was muttering under her breath occasional words like “mum” and “Mayday”.
Police are appealing for witnesses and are looking for two young black males who were wearing hooded tops.
Detective Chief Inspector Cliff Lyons, of Scotland Yard's Homicide and Serious Crime Command, said: “It is a tragedy for the three-year-old, the man's wife and the son he will never see.”