Con laravel, lo solucione de esta forma.
Gracias.
Código PHP:
$user = AppUser::find($id);
$user->fill([
'username' => $request['username'],
'first_name'=> $request['first_name'],
'last_name' => $request['last_name'],
'email'=> $request['email'],
'password'=> $request['password'],
'profile_id' => $request['profile'],
'inst_company_id'=> $request['company'],
'is_active' => $request['is_active'],
]);
$user->save();
Session::flash('message','The user has been updated.');
return Redirect::to('/user');