You cannot use console commands (including resurrect) on Xbox 360. The developer console is PC-exclusive. Xbox 360 has no command input mechanism.
If you own the PC version (Steam/GOG), press ~ → prid <refID> → resurrect → moveto player. Or use mods (JK’s NVSE, ConCommand).
On Xbox 360: Save often. Use companions with Medic. Carry 20+ Stimpaks.