It sounds like the final stage was unable to separate.
So now where did it come down?
While launch and separation of the rocket’s first stage went as planned, a clamshell-shaped “fairing” covering the satellite failed to open, meaning it was too heavy to reach orbit, Brunschwyler said on NASA’s online television station.
“As a direct result of carrying that extra weight, we could not reach orbit,” Brunschwyler said. Indications are the satellite “landed just short of Antarctica, in the ocean.”