A 40-year-old man was sentenced to seven years in prison Monday for stabbing another man to death in the street during an argument in 2008, prosecutors said.Carlos Gordon of San Francisco pleaded guilty in January to voluntary manslaughter in the May 18, 2008, slaying of 42-year-old David Martinez.Martinez, also of San Francisco, was found dead at 12th and Market streets at about 1 a.m. on May 19. Read More