The sister of a young woman brutally stabbed to death by a crazed knifeman has spoken about the tragedy for the first time.
Michaela Dunn, 24, was killed in an apartment in Sydney, Australia, in August 2019 by Mert Ney, 23.
Ney was seen brandishing a knife and running along a street before being encircled by members of the public and hauled to the ground by three British men.
