I don't know. My wife hasn't talked to her since she left our house yesterday to meet the deputy. In not sure if what he did was illegal. Destroying her stuff might be but I don't think it's illegal to bust up your house.
If they bought that house since they have been married, it's considered marital property. So 50% of that house is hers.
By him busting up, causing damage to the house, it can be considered destruction of marital property, depending how MO interprets US laws, it could be a crime what he did to the house.
Generally it's illegal to ruin, destroy, cause damage, to any (including the house) property of the spouse, unless he had her consent to do so.
If Tammy, the sheriff or district attorney wants to pursue the damage he did to the house, then can, if MO interprets US laws the same as some states.
It's still considered marital property, even if the house was bought during the course of the marriage, but only his name is on the the title, regardless of how that property is titled. If it was bought while they were married, it's marital property.
If he bought the house before they were married, but he added her name to the deed, it's marital property.
Him destroying her stuff, things she had before they were married, the things you said were of sentimental value, that's a crime for sure.