Morty Graf is one of the earliest reporters on the RDK serial rapist/killer case. He was consulted again by Manhattan Special Victims Unit Detective John Munch when the killings restarted under the pretense that RDK returned.
It was revealed a copycat, Humphrey Becker, committed the killings for his own success, even tracking down Graf to get information from him to stay accurately uncanny to the original killings. Graf was crucial in providing information on the original killer to lead to Becker. (SVU: "Scavenger")