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Probably. Mysterious deaths in chickens are quite commonly Marek's

I would recommend that you look at this thread here. The idea that the Marek's vaccine is an aid against the Marek's virus is frankly only a myth perpetuated by those who profit from it To quote one person in the thread-

I would take them in, and for bedding I recommend raking in part of the area outside of your coop to the inside. Ideally get leaves, grass, etc. from all portions of your property. At least have it as 10% of the bedding so their immune system can develop some sort of immunity

80% of the chicken population is estimated to carry Marek's disease. The vaccine doesn't prevent infection, transmission, illness or death. All the Marek's vaccine does is prevent symptoms from showing until one day suddenly the chicken drops to the ground overwhelmed with viral load It's more...