Retirement Curse

They were my mom, your mom, anyone and everyone's mom. They went to work, took care of their children and their households on their own. Most of them were divorced or widowed. Some received child support when their kids were younger, some didn't get any help at all. The women missed many of their kid's sporting events and choir concerts because they had to work in order to pay the bills. They formed their own tight-knit group. They had to have someone to count on and that was each other! What they didn't know was there was a serial killer on the loose! A very smart, crafty, and seemingly invisible serial killer!
How was this happening right in front of their eyes? They didn't have a clue who or what it was. Was a person doing the killing--or natural causes!