In death, she raised over a million pounds for The Samaritans. In life her aim as she ran last year's London Marathon was to try and beat her personal best of 3 hours 51 minutes and raise a mere £500. But Claire Squires collapsed and died less than a minute before passing the finish line. Her tragic story was beamed around the world and today an inquest to establish what caused her death has been in session.

Ms Squires had put an energy supplement called Jack3d, into her water bottle. Though it's not clear if she actually drank it on the day. The Jack3d - which was something her boyfriend sometimes used - contained the stimulant DMAA, which has been banned in Canada, Australia and New Zealand. It's also been linked to headaches, vomiting, stroke, high blood pressure, increased heart rate and even a death.

Dr Van Der Walt, who performed the post-mortem, said: "…. On the balance of probability I think the DMAA was a contributing factor to her death". The inquest also heard how Ms Squires also had an irregular heartbeat which could also have been a factor.

Written and presented by Marverine Cole