The deceased, identified as Tukaram Tanpure, was working as a messenger with the State Bank of India's branch in Rajgurunagar, about 40 kms from here, they said.
"Tanpure was working with us as messenger and today afternoon, when he was sitting in one of the cabins of the branch, he collapsed on the floor and became unconscious," the bank's branch manager Shridhar Iyer said.
Tanpure was rushed to a Chakan-based private hospital, where he was declared dead on admission, he said.
When asked if the branch was crowded with customers in the wake of demonetisation, Iyer said since morning there was crowd in the branch, however, it was controlled and manageable.
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"Prime-facie, it appears to be a case of cardiac arrest, however, exact cause of death can be ascertained only after the postmortem," he said.
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Later in the evening, Dr Madhav Kankawale, medical superintendent of Chakan rural hospital where post mortem of was conducted, said the cause of death was heart attack.
"Stress or hypertension could be the possible reason for such type of heart attack, however in this case, we do not know whether Tanpure had any previous medical history or cardiac problem," he said.