Robbie Smullen knifed Barry Dixon in the heart after catching the pair alone.Barry, 22, had been wearing just his boxer shorts when he was killed after going back to Shannon’s flat in Perth.Shannon told Smullen, 23, they did not have sex and Barry was only in his underwear because he had spilled wine on his clothes.But he launched a fatal attack and last week a jury at the High Court in Edinburgh found him guilty of culpable homicide.Now Shannon has said she is wracked with guilt over Barry’s death and claimed witnessing the incident has left her with PTSD.She was pregnant with Smullen’s child at the time but later chose to have a termination.The 25-year-old said: “I’ll never be able to live with myself.
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