Joshua Jerome Derriviere Jacques, 28, is being held on suspicion of killing his girlfriend and three of her family. A friend of his girlfriend said that Jacques had only met the family days before.
Tanysha Ofori-Akuffo was one of four people stabbed to death in Bermondsey, London, on Monday. Her husband Danny Ofori-Akuffo told ITV he was destroyed by her death.
The suspect, who is in his twenties, knew the four murder victims killed in Bermondsey including recently retired NHS nurse Dolet Hill, 64, a matriarch who was winning her fight against cancer .
Joshua Jerome Derriviere Jacques, 28, the boyfriend of one of the victims, Samantha Drummonds, was inside the property in Bermondsey, south London when police arrived.