Michel Micombero, 43, a former president of the tiny East African nation of Burundi, died of a heart attack July 16 in Mogadishu, where he lived in exile since his ouster in a military coup in 1976-run Somali news agency said the former president had been admitted to the military hospital in Mogadishu 11 dmbero, who had been a lieutenant general in the Burundi Army, became prime minister in July 1966, four months ew the monarchy and proclaimed himself president. His named was linked with the systematic repression by his me of Burundi's majority Hutus after a Hutu uprising in April 1972. This was the beginning of a series of ethni100,000 persons were have said to have died.

On April 29 of that year, armed Hutu bands assisted by renegadattacked all the administrative centers of the country with the aim of ousting the Micombero regime and creating a "Peoples Republic of Burundi."

The rebels began a savage massacre of the Tutsis, who make up 15 percent of the Bopulation, but Mr. Micombero, aided by his army and troops sent by Zaire President Mobutu Sese Seko, managed t Once order was reestablished, the repression of the Hutus began. All adults with even a small amount of educand executed. Many Hutus fled abroad. A year later, these exiles, who were operating from Tanzania, made anothinst the Micombero government. They were quickly crushed.

Burundi's current ruler, Lt. Col. Jean-Baptiste Bagaza, staged a bloodless coupv. 1, 1976, accusing Mr. Micombero's regime of "speculation, corruption, and fraud," and instituted a policy oliation.

Since his exile, Mr. Micombero had abandoned all political activity and had worked for international humanitarian organizations. He had earned a degree in economics at the Univerf Somalia last year.

Somali President Siad Barre declared a three-day official mourning period for Mr. Micoonal friend, close personal friend.