Get this one right then and I will buy you a pint.

[Dom Tuk]

Name 3 serving heads of state who died when on a state trip abroad. From the 20th century only.

[stuckinfirst]

Think I've got one! King Faisal of Iraq (1933). Sorry can't help with the others!

[pjwillcox]

President Samora Machel of Mozambique died in a plane crash on his way back from a visit to Zambia in the late 1980's.

[Pea Pod]

Can you research this.. The presidents of Uganda.Rwanda and Burundi were killed 6th April 1994 plane crash Kigali.On reading further only President Habyarimana of Rwanda and President Ntaryamira of Burundi names are mentioned.

[Dom Tuk]

The ugandan president was not onboard the plane (museveni?). The rwandan president who was killed died in his own country so does not qualify. The Burundian president was not on a state visit as far as i can gather.

[Dom Tuk]

King Faisal was staying in bern, switzerland when he had a heart attack. was it a state visit or a private visit ???

The Mozambique president is a correct answer.

[kettledrum]

King Abdullah of Jordan ( grandfather of King Hussein) was assassinated in Jerusalem on 20 July 1951.....but I don't know if he was on a state trip abroad....or even if Jerusalem was 'abroad'

[Dom Tuk]

The only other one i can get is Prime minister LB Shastri of India who died in Tashkent during a state visit.

Who is number 3??