“Saturday Night Live” writer Jimmy Fowlie took to Instagram on Wednesday to share that his sister, Christina Downer, is “no longer alive.” The post comes four months after Fowlie revealed that she had gone missing. “The LAPD has informed our family that Christina is no longer alive, and the case has officially transitioned from a missing person to a homicide investigation,” Fowlie wrote. “Our prayers for her to be found safely have transformed into prayers for the truth to be revealed and for those responsible to be held accountable.” Fowlie explained that he believes Downer’s “phone and social media were compromised” in the weeks before she went missing. He added that the people responsible for her disappearance “used it to hide the fact she was gone, to ask for money, and to create a false narrative that she was going ‘off the grid.’” Popular on Variety “I am sharing this because I believe that whoever is responsible is hoping to erase her in every way possible,” he added.…