‘Buffy’ star Sarah Michelle Gellar honors late on-screen sister Michelle Trachtenberg

Michelle Trachtenberg’s former “Buffy the Vampire Slayer” costar Sarah Michelle Gellar is looking back at their time together on screen and off, one day after Trachtenberg died in New York City.

​ Michelle Trachtenberg’s former “Buffy the Vampire Slayer” costar Sarah Michelle Gellar is looking back at their time together on screen and off, one day after Trachtenberg died in New York City. Read More Breaking News, Latest News and Videos | CNN