Was the verdict in the Kate Steinle murder trial fair?

The verdict in this trial has generated quite a bit of uproar, including from Trump.

Jose Garcia Zarate was an illegal immigrant who had been deported five times. Only July 1, 2015, Zarate fired a gun that killed 32-year-old Kate Steinle while she was walking along a pier in San Francisco with her father. Yesterday, Garcia Zarate was found innocent of all charges except a weapons charge. He will serve prison time for the weapons charge and then be deported for the 6th time.

Many are surprised and dismayed at the verdict. Some felt he should’ve at least been found guilty of manslaughter. The prosecution attempted to prove 1st degree murder, but evidently didn’t. Zarate always claimed that he found the gun and that it accidentally discharged (the bullet that killed Steinle apparently ricocheted off the concrete ground before hitting her).

Did Zarate get OJ’d or was this fair?