We know it is not just limited to filicide. There are to many instances where such crimes are not limited to one’s own children.
Tim McVeigh, Twin Towers, Speck all prime examples of mass murder where guns were not used.
Murder in Memphis, Deborah Groseclose
http://truecrimebookreviews.com/2011/06/murder-in-memphis-dorris-porch-rebecca-easley-deborah-william-groseclose/ This creep hired men to murder his young wife. Let them into the house, while he slipped out with the kids. She was Raped, stabbed, beatened, strangled until she passed out. Stuffed into the trunk of her car, which was then relocated down town, where she is still alive, she COOKED TO DEATH in the 100 + summer temps of Memphis. A anti-death penalty federal judge and 2 state supreme court judges kept blocking the use of the DP. They finally were retried, found guilty again, and given Life WITH parole. There is 1 sick sister left to fight the parole hearings.
The article, however, is about filicide.