On the same evening, Amaan Shakoor, 16, became the youngest murder victim of the year so far when he was shot in an attack in Walthamstow.
A man is in custody for stabbing a man to death and beating his estranged wife with a baseball bat, authorities say.
Officers, paramedics and London's Air Ambulance rushed to Chestnut Avenue at about 10.50pm.
It follows the fatal stabbings of two people in separate domestic incidents in the capital on Sunday.
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Alfie's parents say their son has improved in recent weeks and had asked Mr Justice Hayden to allow a new assessment. Hayden said details of that plan could not be revealed because Alfie was entitled to privacy at the end of his life.
"A male aged in his 20s has been arrested on suspicion of murder".
Police said the victim and suspect were believed to have been known to one another.
Officers were called to a residential address in Sudbourne Road, Brixton, at around 6.36pm on Sunday.
Detectives have arrested a man in his 20s in connection with the murder.
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In January, Harder wrote the cease-and-desist letter sent to former White House Chief Strategist Steve Bannon. That was a sharp drop from the previous quarter, when the campaign paid the firm almost $215,000.
The teenager was pronounced dead at the scene just over half an hour later.
Dihan was the prime accused in Robin murder case filed with Kotwali Police Station a year ago, police said.
Police said his family were still being informed and that formal identification and a post-mortem would be arranged.
A cordon remains in place at the scene as investigations continue.
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A shocking 59 people so far this year in London's knife crime epidemic.
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