A University of California at San Francisco shuttle bus driver has been charged with misdemeanor vehicular manslaughter for allegedly running a red light and causing a crash in July that killed a doctor on board, prosecutors said Thursday.

Wallace Richardson, 64, was the driver in the July 14 crash at Octavia Boulevard and Oak Street that killed Dr. Kevin Mack.

Richardson turned himself in to Millbrae police on Tuesday after a warrant was issued for his arrest last month, district attorney's office spokeswoman Stephanie Ong Stillman said.

The shuttle bus was carrying about 15 people when Richardson allegedly entered the intersection on a red light and struck a big-rig traveling north on Octavia Boulevard, police and prosecutors said.

Mack was ejected from the shuttle and was pronounced dead at the scene.

The case was one of four mentioned by District Attorney George Gascon at a news conference in November at which he stressed that his office would be cracking down on traffic safety violations.

One of the four cases involved a San Francisco Municipal Railway bus driver who struck and killed 23-year-old Emily Dunn in the city's Castro District in August. The driver, 36-year-old Wallace Loggins, is scheduled to be arraigned Friday.

In a second case, 23-year-old Randolph Ang was charged in November for allegedly running a red light on his bicycle and fatally striking a 68-year-old pedestrian at The Embarcadero and Mission Street on July 15.

In December, prosecutors filed charges against Gregg Wilcox, 60, who was allegedly driving his vehicle with a cast on his right foot.

Both Ang and Wilcox have pleaded not guilty to the charges against them.