James Charles Kopp (born August 2, 1954) is an American citizen who was convicted in 2003 for the 1998 sniper-style murder of Dr. Barnett Slepian, an American physician from Amherst, New York who performed abortions. Prior to his capture, Kopp was on the FBI's list of Ten Most Wanted Fugitives. On June 7, 1999 he had become the 455th fugitive placed on the list by the FBI. He was affiliated with anti-abortion group "The Lambs of Christ".
He has been referred to as a terrorist by the National Memorial Institute for the Prevention of Terrorism, and was "well-known in militant anti-abortion circles, where he was nicknamed Atomic Dog"
James Charles Kopp was born in Pasadena, California and raised Lutheran, but later converted to Catholicism. Kopp started providing support to anti-abortion groups after his girlfriend underwent an abortion, and used his technical abilities to create special locks that protesters then used on the doors of abortion clinics.