How and when did your other chickens die? Predators, disease?
If anything traumatic happened in the summer, or a change in their environment happened (like a new coop), they could have stopped laying for a bit. Chickens are sensitive to disruptions in their routine, or pretty much all changes in general, which could lead to a temporary halt in their egg production.
So maybe... by the time they got their bearings again, the days became shorter and their pineal glands told them to just stop laying altogether for the winter. Many chicken breeds will keep laying fine through their first couple winters, but then their bodies need to take a break. My girls laid great through their 1st winter, a little less the second, and then completely quit the 3rd winter, but started again in the spring. Laying hens need at least 14 hrs of daylight to produce eggs, so by this time of year -regardless of the time they already quit, they are unlikely to start laying again until the days get longer.
Some people add supplemental light in winter to keep the eggs coming, which is still possible for you too, just start in gradual increments:
Supplemental Light in the Chicken Coop: Why and How
Dangers of Supplemental Coop Light
(had to throw that link in there too!)
Or you could try a regular flock rotation in the future to keep yourself in a steady supply of eggs all year:
A Three Year Chicken Rotation
Best wishes!