Activists blamed armed government supporters for shooting a student near his home in Valencia City.
The Venezuelan opposition leader has been charged with inciting post-election violence.
Nicolas Maduro narrowly beat opposition challenger Henrique Capriles in the polls.
Opposition leader Henrique Capriles has demanded a full recount of votes from Sunday's election.
Venezuela’s next elections will be a test to Hugo Chavez’s socialist legacy.
The Venezuelan acting president pledges to rule out corruption after accusations by election rival.