Repaying Deposit to Tenant who gave no notice to Move out?

[Jim Goebel]

We have a rental property where a tenant just up and moved out.  We have an onsite property manager and there was no notice given to either him or to me.  The tenant has a bit of a combative personality and seems to have trouble navigating resolving conflict - at first, I was thinking to offer him some percentage of his deposit back right away, or wait for some period of time to evaluate the impact of the vacancy and inability to market the place.  I'm looking for some legal perspective with regards to how much of the deposit would be defensible to withhold?

Thanks much for any thoughts or advice!