A former Baltimore prosecutor reacted tonight during "On The Record" to the charges against six Baltimore police officers in the death of Freddie Gray.

Kurt Nachtman, who previously worked with Baltimore State's Attorney Marilyn Mosby, told Greta Van Susteren he's "deeply disturbed" by the way this case is being prosecuted.

"I think that this case frankly is either overcharged or undercharged," he said. "Part of the problem is it seems like the prosecution has a shifting theory of the case."

Nachtman explained "first they started off with this knife, then they're saying that the arrest that was made lacked probable cause and now based ... on the response to the bill of particulars that was filed, it seems as though they're saying the van was somehow the instrumentality of the actions of the officer."

Van Susteren asked Nachtman if he thinks Mosby is "over her head" with this case. 

"I think that maybe she is over her head, but you know it's one of those situations where you would hope that the person who's charged with being the lead prosecutor for a major metropolitan area is going to take their time and is going to be deliberate and thoughtful when they're making such a huge decision," Nachtman replied. 

Watch the clip from "On The Record" above.

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