Daniel Zamudio attacked in Santiago park in 2012
Gay nuptials bill part of ‘amicable settlement’ in lawsuit
Final vote on measure expected before end of the month
Measure seeks to end ‘historic discrimination’ against gay couples
Supporters say measure ‘strengthens’ families
LGBT advocates describe vote as ‘step forward’
Brief in gay nuptials lawsuit became public this week
Wladimir Sepúlveda spent nearly six months in a coma
Michelle Bachelet defeated conservative rival in December
Esteban Parada Armijo died in a Santiago hospital on Jan. 30
