Gautam Bhansali, a doctor at Bombay Hospital, also said Himanshu Roy "looked much thinner compared to what he was before and he had even grown a beard".
Officer allegedly shot himself using his licensed weapon around 1.40 pm.
Roy, the additional director-general of police (establishment), was a fitness enthusiast and had headed elite wings such as the anti-terrorism squad and the crime branch.
He was reportedly suffering from bone marrow cancer and was on medical leave.
Speaking to Firstpost, D Sivanandhan, former police commissioner of Mumbai who was closely associated with Roy, said he was unable to believe that Roy had taken such a step. Senior colleague MN Singh told NDTV, "He was a very bright officer". I found him very sharp, very polished, very sophisticated. "We should think of giving a break to our police officers between two assignments".
Maharashtra's Specialist Specialist IPS Officer Himanshu Roy has committed suicide.
Born on June 23, 1963, Roy grew up in Colaba.
On May 21, 2013, a Mumbai Police team led by Roy arrested Bollywood actor and ex-Bigg Boss contestant Vindu Dara Singh for suspected links with the spot-fixing scam in the 2013 Indian Premiere League (IPL) tournament. He also investigated murder of Laila Khan and 5 other relatives at family's Igatpuri house.
Roy started his police career as Superintendent of Police (Rural) in Nashik and Ahmednagar. He is also credited with setting up Mumbai's Cyber Crime cell. He continued to work while under treatment. Former Mumbai Police commissioner Arup Patnaik, who had last month joined Biju Janata Dal, said that Roy, his junior, had approached him around three months ago and sought the number of a renowned Mumbai-based oncosurgeon.
Speaking after Roy's death, Maharashtra Chief Minister Devendra Fadnavis while making a statement on Friday said, "He was known as a daring officer and had held many important positions".