A Northern Ireland family who lost a father and two sons in a weekend farming accident have confirmed that the men died trying to save each other.
A fourth person, understood to be their sister, also fell into the tank and was taken to hospital where she was recovering from the effects of inhaling fumes.
The accident happened at a farm in Hillsborough, County Down.
Two of the men were declared dead at the scene, while the third was taken to hospital, where he died shortly afterwards.
The large tanks are used to store slurry - a combination of cow manure and water - until it is ready to be used as fertilizer.
Spence was considered a rising star of rugby union, having represented Ireland at under 20 level and being called to the Ireland training squad for the Six Nations last year.
Rugby fans began leaving scarves, flowers and other tributes at Ulster's east Belfast ground on Sunday.