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A man was arrested after he allegedly stabbed a pregnant woman to death, attacked her elderly pit bull, then set her apartment ablaze.Authorities say it happened after the victim, found with around 70 wounds to the neck and head, agreed to a Facebook Marketplace meetup while her husband was at work.The suspect was located at a home with his girlfriend after law enforcement noticed the 94 Ford Ranger the family had sold him.Police said he was "upset about the condition" of the vehicle.