It can depend on the states where the hitman killed the person and the courts and laws.
Most likely if the hitman is caught then they will be charged with the murder of the person they killed.
Then if the person who hired the hitman is found and arrested too and then found guilty then they would be charged with murder as well as conspiracy to the murder.
But if you're charged with murder then both of you will likely either get the death penalty or 25 years to life in prison or life in prison.