As more details emerged in the massacre at a Crandon, Wis., homecoming party Sunday morning, grieving residents are asking how a young sheriff's deputy who murdered his ex-girlfriend and five others with his SWAT-team rifle could have become a police officer without psychological testing. None is required in Wisconsin, reports the Chicago Tribune.
Peterson was killed by police after a standoff of several hours Sunday afternoon.
After the killings, Peterson had sought refuge with a friend in a nearby cabin; police attempted unsuccessfully to negotiate his surrender. Peterson told the friend he had come to the party to try to rekindle his relationship, but was met with ridicule. "We are in shock and disbelief that he would do such terrible things," Peterson's family said. "This was not the Tyler we knew and loved."