Need to force close the "Phone" (Dialer) app manually I have LG E612 (Jelly bean 4.1.2).

My problem is, my phone (dialer) app will not close automatically when I press "Back" from dialer to Home screen.

Phone app is still running in background, and I need to close it through a task killer.

Is this a normal behavior with all android phones? If not, is there any settings for this?
Thanks @RossC, for your comments.

Adding this as answer:


  Leave the memory management to the OS. It depends on the version
  (4.1.2 in your case), the OEM (LG) and the particular dialer app. As a
  rule, task killers degrade performance, and the app being in memory
  has no impact on your battery or performance. I'd say leave it be.