Yes, you can cancel life insurance coverage by writing to your insurer and requesting the necessary forms to complete and return to the insurer so your policy can be terminated.
Another option may be to stop paying your premiums on your life insurance policy.
Remember, if you have automatic withdrawal set up to pay your monthly premiums, make sure to contact your bank or credit card company to stop payments to the insurance company.
If you are changing to a new insurer to save money on your life insurance, make sure you have your new life insurance policy "In Force" before cancelling any existing coverage, so you are not at any time without protection.
Learn more about how to cancel a life insurance policy.