Barren Earth — Eric S. Brown

In 2118, the deep space exploration vessel, The Hyperion, left Earth. Its crew never imagined that coming home would be the most dangerous and deadly part of their voyage. Upon on their return, five years later, the Earth is dead and humanity is at war with its own dead. The colonies of man struggle to survive against the flesh eating zombies who now rule their home world and seek to spread the virus which created them among the stars.