Judge Robert Chatigny, nominated for the 2nd U.S. Circuit Court of Appeals, faced withering questions Wednesday from Republicans on the Senate Judiciary Committee about how he handled the case of a notorious serial killer.

The serial killer, Michael Ross, was nicknamed the “Roadside Strangler” for a string of killings in the early 1980s. In 2005, Chatigny, as a federal district court judge, pushed for a hearing to determine Ross’ mental competency. He pushed so hard that prosecutors later filed an ethics complaint against him.