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Bank of America intern died of natural causes

Moritz Erhardt, Bank of America intern who died

The intern at Bank of America Merrill Lynch who collapsed and died at his home in London in August, died of natural causes, a coroner said on Friday.

Coroner Mary Hassell found that Erhardt died after an epileptic seizure, a spokesman from east London's Poplar Coroners Court told CNBC. She recorded a verdict of "natural causes" at the hearing.

Hassell said Erhardt had been on regular medication for epilepsy, a spokesman confirmed. The court also heard that his seizure could have been triggered by fatigue, but may not have been.

(Read More: 'Grueling' hours at banks in focus after intern death)

Moritz Erhardt, who was 21 years old, died at his home in Bethnal Green on August 17 while part of the internship program at Bank of America Merrill Lynch's (BofA) investment banking division in London.

Erhardt had allegedly been working until 6 a.m. for three days in a row, according to newspaper reports at the time, with only a short rest at his home before returning to the office early each morning.

(Read more: BofA intern dies after reportedly working 3 straight days)

"We continue to extend our heartfelt condolences and sympathy to Moritz's family. Moritz Erhardt's death was a tragedy that affected and saddened everyone in our company and especially those who had the privilege to spend time with him. He was an exceptional student and it was our intention to offer Moritz Erhardt a full time position with us on graduation," a spokesman for Bank of America Merrill Lynch told CNBC via email.

The bank recently announced that it was setting up a senior working group to review the work environment for junior employees, in an effort to create better working patterns and improve work/life balance.

By's Matt Clinch. Follow him on Twitter @mattclinch81