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US teenager Eric Knysz, 19 and pregnant wife Sarah, 20, charged with cop's murder

Expectant parent Eric Knysz allegedly shot and killed a Michigan state trooper and his wife Sarah fled the scene with him.(Facebook)   A teenager and his pregnant wife have been charged after he allegedly shot a policeman in the head during a routine traffic stop.   Eric Knysz, 19, was charged with murder of an officer and three other offences related to the fatal shooting of Trooper Paul Butterfield, The New York Daily News reported.    The suspected gunman's wife, 20-year-old Sarah Knysz, was also booked, accused of fleeing the scene with her