As the summit closed on 28 September 1970, hours after escorting the last Arab leader to leave, Nasser suffered a heart attack. He was immediately transported to his house, where his physicians tended to him. Nasser died several hours later, around 6:00 p.m. Heikal, Sadat, and Nasser's wife Tahia were at his deathbed. According to his doctor, al-Sawi Habibi, Nasser's likely cause of death was arteriosclerosis, varicose veins, and complications from long-standing diabetes. Nasser was a heavy smoker with a family history of heart disease—two of his brothers died in their fifties from the same condition. The state of Nasser's health was not known to the public prior to his death. He had previously suffered heart attacks in 1966 and September 1969.