Tags: Soap Character.
Geraldo Markko Rivera is a fictional character on ABC’s daytime drama One Life to Live. He has been portrayed by Jason Tam since May 21 2007. Tam last aired as Markko on November 10 2010 when he left town to continue studying at UCLA. He returned on April 11 & 12 2011 to coincide with Langston’s exit and on July 28 & 29 2011 for his Vicker Man film premiere. He made an appearance during the final episode of the show on January 13 2012.