James Brindley, 26, from West Midlands, was stabbed to death on June 23 2017
He was stabbed through the heart with the knife, 400m from his parents home
Local teenager Ammar Karhod was convicted of James murder in 2018, got life
New MTV documentary True Life Crime, airing tonight, sheds light on the case
James sister Charlotte says yearns for brother and part of her died with him