Capital punishment in the United States:

In New Jersey and Illinois, all death row inmates had their sentences commuted to life in prison without parole when the death penalty repeal bills were signed into law. In Maryland, Governor Martin O'Malley commuted the state's four remaining death sentences to life in prison without parole in January 2015. While the bill repealing capital punishment in Connecticut was not retroactive, the Connecticut Supreme Court ruled in 2015 in State v. Santiago that the legislature's decision to prospectively abolish capital punishment rendered it an offense to "evolving standards of decency," thus commuting the sentences of the 11 men remaining on death row to life in prison without parole. New Mexico may yet execute two condemned inmates sentenced prior to abolition, and Nebraska has ten death row inmates who may still be executed despite abolition.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". The governor of what state commuted four death sentences in March 2015?
unanswerable