Kenan Thompson is reflecting on the death of his beloved Nickelodeon costar Michelle Trachtenberg."It was such a shock," the longtime Saturday Night Live cast member, 46, told E! News about how he found out about Trachtenberg's untimely death.

Michelle Trachtenberg was in poor health before she died at age 39 on Feb. 26. Several sources spoke to Us Weekly about the “Gossip Girl” alum’s final days after she got a liver transplant, which may have contributed to her death.