Les Revenants They Came Back (2004)
I found a copy of the original film with English subtitles and right from the start this had The 4400 feel to it but with 70 million dead people returning rather than the abducted from The 4400, Julie asking her grandmother what it was like to be dead was what you would expect from a child and the only difference between the dead and living was their body temperature but they did walk like zombies, Mathieu talking about Rachel as if it was just two weeks and not two years was understandable but his story of what happened the day he died was sad, them all dying as quick as they returned without explanation was bizarre