Police said Mr Otto kept quiet, but later that afternoon things got ugly.
Mr Otto took a crowbar and went to Toafiga's flat where he yelled a threatening, racist comment before raising the crowbar to hit his neighbour, the court heard.
Toafiga grabbed the crowbar before Mr Otto hit him and managed to punch Mr Otto in the face.
Mr Otto fell down and Toafiga hit him with the crowbar three times on his body, the court heard.
When neighbours stepped in, Toafiga threw the crowbar onto the ground.
One neighbour reportedly said: ``You're stupid, you could kill him'''.
Toafiga replied: ``I don't care''. He demanded the crowbar back and told a group of onlookers: ``I want to kill him,'' the summary of facts stated.
Mr Otto was taken to hospital and was found to have fractured ribs and a broken arm. He died nine days later.
Originally Toafiga had been charged with manslaughter but pathologists for the Crown could not be certain that Mr Otto had died as a direct result of the crowbar attack.
Mr Otto was also found to have been suffering from pneumonia, Alzheimers Disease and emphysema.
Toafiga's lawyer Steve Cullen said his client was deeply sorry for what he had done, and was not seeking bail.
Justice Timothy Brewer remanded Toafiga in prison until he is sentenced next month.