As a result , enterprising entrepreneurs marketed serial killer `` murderabilia , '' including calendars , trading cards , T-shirts , action figures , paintings and comic books . Serial murder peaked during the 1970s and the 1970s and , Jack Levin and James Alan Fox write . Rapid growth of U.S. prison population may have contributed to the decline , they say . But there are still dozen serial killers captured the 1970s and by police , they write .
Serial murder peaked during the 1970s and the 1970s and , Jack Levin and James Alan Fox write . Rapid growth of U.S. prison population may have contributed to the decline , they say . But there are still dozen serial killers captured the 1970s and by police , they write .