SAN DIEGO – The teenage son of former state Assembly Speaker Fabian Nuñez and three friends, all from Sacramento, pleaded not guilty Thursday afternoon in San Diego Superior Court to charges of murder and assault with a deadly weapon. Esteban Nuñez, Ryan Jett, Rafael Garcia and Leshanor Thomas are accused of stabbing to death a Mesa College student and injuring three others in a knife fight at San Diego State University on Oct. 4. Judge David Szumowski set bail Thursday at $2 million for Nuñez, Garcia and Thomas, who are all 19 years old. Bail was denied for Jett, 22,...