Tenant Never Cashed Check

[Dave Meyer]

Just got an email from a former tenant. I returned his security deposit 8 months ago, but he never cashed it. Now he wants me to write him another check. Of course right after I just did all my bookkeeping and taxes. 

Lease is fairly vague on this but does say, in reference to returning the tenant's deposit: 

"Owner is deemed to have complied with this paragraph by mailing said statement and any payment required to the last known address of Resident." 

I'm fairly sure I am going to write him another check, just because I don't want to be a jerk, but thought it would be a good question for the community. 

What would you all do?