Dr Fazel commented: "Our results have significant public health implications as around 70 million people worldwide have epilepsy, and emphasise that carefully assessing and treating psychiatric disorders as part as part of standard checks in persons with epilepsy could help reduce the risk of premature death in these patients.
"Our study also highlights the importance of suicide and non-vehicle accidents as major preventable causes of death in people with epilepsy."
The study, which tracked 69,995 people with epilepsy born in Sweden between 1954 and 2009 for a 41-year period, found suicides and accidents accounted for almost 16 per cent of all deaths in people with epilepsy.
Of these, three-quarters also had been diagnosed with a psychiatric condition such as depression. They were the most common cause of death not linked to the underlying disease process.
The researchers also found that the risk of premature death in people with epilepsy compared similarly to their unaffected siblings and the general population. This suggests that epilepsy is an independent cause of early deaths, the academics said.
Simon Wigglesworth, deputy chief executive of Epilepsy Action, said the study was cause for concern.
"The findings of this research are concerning and highlight the need for excellent healthcare for people with epilepsy", Mr Wigglesworth said.
"Getting the best possible support and treatment is important to help to reduce the likelihood of people with epilepsy experiencing mental illness. And a holistic approach to managing the condition should help ensure that people with epilepsy get the best possible treatment for both their epilepsy and any associated conditions.
A separate study published last week warned that children whose mothers take anti-epilepsy drugs during their pregnancy face an increased risk of developing autism.
By the age of three, children were four times more likely to show traits associated with autism if their mothers had taken drugs to control their epileptic seizures.
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People with epilepsy 11 times more likely to die prematurely, study finds