jordan sharifi , 17 , ` gave raymond howell , jr. , 14 , a gun and ammunition to protect himself from bullies but raymond used the gun to take his life '
sharifi found his friend 's body in a rain culvert on thursday morning ` and threw the gun in a nearby drainage tunnel '
he was arrested by mckinney , texas police on friday and charged with theft of a firearm and making a firearm accessible to a child .
raymond left him a note before he took his life , sharifi said .
the school district says it has found no evidence that raymond or his family contacted them about bullying .