Up until his death, the 68-year-old was the executive director of the United Nations Population Fund (UNFPA)
According to sources at the UNFPA, his death was announced at the Nigerian office of the UN body on monday morning.
During Ositimehin lifetime, he was dedicated to gender, youth and maternal health issues.
His last personal tweet alive was for 'protecting the health and rights of women and their babies', which he said 'Is vital to protecting our shared future'.
Ositimehin was born on February 1949 and hails from Ijebu Igbo part of Ogun state. He attended Igbo college in the late 90s before moving to the United Kingdom for his University education.