Is Krishna dead? Yes Krishna is dead. She had actually died in the accident that separated Gangaa and Sagar. Shiv also knows about this fact and that is why he is keeping gangaa preoccupied so she doesn’t remember her daughter.
Shiv managed to find out that Krishna perished in the boat/ storm accident that separated Ganga from the Chaturvedi’s in the first place. Krishna’s death is what broke Ganga and forced her to realize that she doesn’t have any other family again, which led to her accept the Jha’s and also Shiv as her husband.