Feds involved in Ellen Greenberg case, parents say

(WHTM) -- Ellen Greenberg died 15 years ago in her Philadelphia apartment from more than 20 stab wounds, including some on her back. The city's medical examiner's office ruled the 27-year-old teacher's death a homicide, then changed it to suicide. Greenberg's parents, Sandee and Josh Greenberg, said they've been fighting for 15 years to change [...]