Memory leak caused by function in C++

there is a function which creates new memory and is used in constructor.
However, I do not know how to access it in destructor to delete it.

In constructor is used (same file) player.cpp

#include 

#include "Player.h"


// TODO: Fix the bugs in this file

Player::Player(const char* name) : name_(0)
{
  copyString(&name_, name);
}

Player::Player(const Player& copy) : name_(0)
{
  name_ = copy.name_;

}

Player::~Player()
{ 
  delete [] name_; // Not sure if it works. errors promts- double free
}

Player& Player::operator=(const Player& copy)
{
  return *this;

}

void Player::copyString(char** dest, const char* source)
{
  unsigned int str_len = strlen(source);
  char* str = new char[str_len+1]; //This line
  strncpy(str, source, str_len);
  str[str_len] = '\0';

  *dest = str;

}

std::ostream& operator<<(std::ostream& out, const Player& player)
{
  out << player.name_ << std::endl;
  return out;
}

All i am allowed to change are .cpp files.

I have added delete line i destructor, but error shows up.