A Melbourne man who fatally bashed his gay housemate with a platypus statue during a fight has been found guilty of murder.

Aaron James Johnstone, 29, "lost it" after his drunk and naked housemate Phillip Higgins propositioned him in September 2006.

Johnstone told police he assaulted Mr Higgins before dropping the eight-kilogram platypus statue on him.

Johnstone had pleaded not guilty to murder in the Victorian Supreme Court but a jury took less than a day to find him guilty.

In his opening address to the jury, prosecutor Mark Rochford, SC, said Johnstone carried out a sustained attack on 46-year-old Mr Higgins.