American musician Chris Perez is best known as the lead guitarist for the group Selena y Los Dinos. Perez and the frontwoman of the group (Selena Quintanilla-Perez) were married in 1992. Selena was murdered in 1995 in Corpus Christi, Texas at the age of 23.
No, Chris Perez, the husband of Selena, did not marry her sister after she died. Chris became very depressed after the death of his wife and didn't remarry until 2001. He divorced his second wife in 2008.