<sod > Joshua Stimpson has been found guilty of the murder of his ex-girlfriend Molly McLaren after a jury rejected claims he had diminished responsibility due to mental health issues A jilted boyfriend who followed his ex-girlfriend to a gym and repeatedly stabbed her in her car has been jailed for life for murder.< eod>< sod >  Joshua Stimpson has been found guilty of the murder of his ex-girlfriend Molly McLaren after a jury rejected claims he had diminished responsibility due to mental health issues The family of a university student stabbed 75 times by her obsessive ex-boyfriend said they are a facing 'a lifetime of pain, anguish and loss' as he was jailed for at least 26 years today.  Joshua Stimpson had posted menacing messages about Molly McLaren on Facebook before he attacked her at a retail park in Chatham, Kent last summer. Miss McLaren had twice contacted police about her ex's behaviour, the second time less than a week before her death, but he ignored officers' warnings to leave her alone. They were cries of 'Yes' from Miss McLaren's relatives as a jury rejected his claims of diminished responsibility due to bipolar disorder and convicted him of murder today. Judge Adele Williams branded Stimpson's crime 'cruel, calculated and cowardly' as she jailed him for life and ordered he serve at least 26 years behind bars.< eod>