Been hearing a squid today car jerked and died now wont start!!

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The past few days I've been hearing a squealing sound from the motor in the passenger side. while pulling out of a parking lot today upon acceleration the car did a light jerking and died now it will not start sounds like the pulleys wanna turn but one is sealed and won't let the rest turn (it's like a huff squeal). My brother was watching the pulleys while I turned it over and said it looked like the altanater pulley didn't budge