Yeboah's death is described as a "devastating blow" for London Zoo
London Zoo has suffered a "devastating blow" following the death of one of its male gorillas less than six months after he arrived.
Yeboah, who weighed 20 stone, arrived at the zoo in November from France to live with three female gorillas.
Despite repeated attempts to resuscitate him, he died.
The zoo's three female gorillas, Effie, Mjukuu and Zaire, will be monitored closely by keepers while they adjust to their loss.
The results of a post-mortem examination on Yeboah are expected to be revealed in a few weeks.
It is the second time in less than two years that the zoo has lost a young male gorilla to unexpected illness.
In December 2008, Bobby - a 25-year-old silverback - was found dead in his nest after a heart attack.
A spokesman said: "Yeboah's death has been a devastating blow to everyone here."