Trevor Muirhead and Neil McKenzie were originally accused of conspiring to murder but this charge was thrown out a day before the trial concluded due to insufficient evidence.
Click here for the full details of what the pair were found guilty of.
More top news
The slump will spark scrutiny, especially as statistics show a rise in racially or religiously motivated offences following the EU vote.
The 53-year-old was killed shortly after leaving her home in Mosta, Prime Minister Joseph Muscat said.
Jordi Sanchez of the Catalan National Assembly and Jordi Cuixart of the Omnium Cultural group were jailed on Monday.