PORTAGE, Wis., Dec. 3 -- Serial killer Jeffrey Dahmer and fellow inmate Jesse Anderson -- both killed in an attack at Wisconsin's Columbia Correctional Center this week -- were two of the nameson a hit list Dahmer's lawyer said Saturday he obtained from a prisoner. Investigators refused to comment on claims by Steven Isenberg that he received a letter from an inmate describing a hit list of seven prisoners at the Wisconsin facility. Isenberg said he knows the five remaining names on the list and is fearful there will be further violence at the prison. Columbia Warden Jeffrey Endicott would not comment on the report. Investigators have said they are not ruling out the possibility of a conspiracy in the beating deaths of Dahmer and Anderson. Sheriff James D. Smith said his inquiry is focusing on eight individuals who were in the area of the prison where the attacks occurred. Dahmer, 34, and Anderson, 37, were attacked Monday as they were cleaning separate bathroom facilities in a recreation area at the facility. Dahmer died Monday en route to a hospital and Anderson died after he was removed from life support Wednesday at the University of Wisconsin Hospital in Madison. Prison officials have identified Christopher Scarver, 25, convicted of killing a Wisconsin Conservation Corps crew chief, as the main suspect in the attack. At a Thursday news conference, however, Smith confirmed the investigation was much more far-reaching. 'We are conducting an investigation focusing on eight people who were in the vicinity of the recreation building where the assault occurred,' Smith said.
Asked whether a conspiracy was involved, Lt. Vern Gove answered: 'I'm not ruling that out. OK?' Dahmer, Anderson and Scarver were all part of a work detail. Two prison guards and a recreation director were in the area at the time but had left the prisoners unsupervised for about 20 minutes. Several inmates also were brought to the area. A bloody broom handle found at the crime scene has been sent to a lab for analysis, Smith said. It was still not clear, however, whether the broom handle was the weapon used in the attacks. Dahmer admitted killing 17 young men and boys, dismembering their bodies and cannibalizing some of them. Anderson was convicted in the stabbing death of his wife, although he tried to blame the murder on two non-existent black men. Early in the investigation, authorities said they did not think the attacks were racially motivated. However, Scarver, who has a Christ complex, has voiced hatred of whites. Both Dahmer and Anderson were white. Scarver is black.