The vehicles involved in the M6 crash were a silver Volkswagen Polo and three motorcycles - a red Aprilla 750cc, a blue Kawasaki 500cc and an orange Kawasaki 1000cc.
The 62-year-old man who died was the rider of the orange Kawasaki.
His passenger, a woman in her 50s was also seriously injured. Her condition is described as critical.
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The victim sustained serious injuries to his leg, torso, head and back after being in collision with a vehicle.
Police are asking people to get in touch if they recognise this man.