This is How a Heart Breaks

Jane investigates the death of an ex-serviceman living on the streets demonstrating classic PTSD symptoms. Maura and Jane save the life of a man brought into the morgue by performing a tracheotomy. Maura dates a man who turns out to be a bit of an artist and they are caught tagging graffiti by Jane's brother. When the friend of the victim, another ex-serviceman, and a documentary film maker are found dead and killed by the same weapon as the first victim Jane must find out why. A clue in an electronic keyboard leads them to the killer who turns out to be a "wannabe" street artist but has no talent so killed the first man, who has been producing street art to explain what he experienced when on tour in Iraq/Afghanistan, so that he can sell the work and make a name for himself. Heartache for Jane in this episode as she sees an old flame who refuses to see her again for reasons unknown to Jane.