A 21-year-old Bank of America Merrill Lynch intern who died in London last week had reportedly been working more than 20 hours a day.
Moritz Erhardt, a University of Michigan student from Germany, was coming to the end of a seven-week internship when he collapsed in the shower last Thursday.
He was found unconscious at Claredale House, a student residence in Bethnal Green, and was pronounced dead by paramedics at the scene.
One anonymous poster on website the wallstreetoasis.com said: "He was found dead in the shower by his flatmate. Intern at BAML [Banking of America and Merill Lynch] who went home at 6am three days in a row."
A fellow intern told the Evening Standard Mr Erhardt was a "superstar" who worked "very hard and was very focused".
BAML would not comment on speculation that Mr Erhardt had recently worked very long hours.
However, in response to being asked if it is common for people to occasionally work through the night there, a spokesperson said: "We've all done it."
In a statement the company said: "We are deeply shocked and saddened by the news of Moritz Erhardt's death.
"He was popular amongst his peers and was a highly diligent intern at our company with a promising future. Our first thoughts are with his family and we send our condolences to them at this difficult time."
An email sent to students staying at Claredale House after the student's death said: "Some of you might be aware that the emergency services were called to Claredale.
"The reason for this is that we were made aware of an incident involving one of our residents. Sadly the resident concerned had passed away.
"To avoid any rumours or misinformation, we would like to inform you all that there were no suspicious circumstances surrounding the death."