President Michelle Bachelet plans to sign measure
Final vote on measure expected before end of the month
Measure seeks to end ‘historic discrimination’ against gay couples
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
Esteban Parada Armijo died in a Santiago hospital on Jan. 30
Country's president-elect supports measure
Alejandro Alfredo Bustamante Godoy stabbed in neck
Country’s Senate voted 28-6 to move measure out of committee