As to Jacobsen, she had a son who attended a Cumberland County elementary school -- and whom she "loved more than life itself," according to a friend who asked not to be named before they had not been friends for long.
"She was very nice, she was innocent, and she couldn't stop talking," the friend said.
Located about 70 miles west of Knoxville and 110 miles east of Nashville, Crossville is a small city that serves as the county seat for Cumberland and its 57,000 people. It's a place that the school superintendent describes as a "down-home type community" where "everyone seems to know everyone."
As a result, everyone has been shaken by this week's carnage.
Students in the county's 12 schools, particularly its three high schools, were told about the killings Friday morning, then encouraged to talk about it in class or with counselors.
"Some were very quiet, some were reflective, some were more open," said Andrews. "The mood at the schools was very subdued."
"It was just a surprise. It's one of those 'this doesn't happen here' kind of things. It's actually a grim reminder to us all that we're all vulnerable," he said.
But what, if anything, made these four victims particularly vulnerable, leading to their deaths, hasn't been revealed.
Was it a drug deal gone bad? A theft? A fight? Residents want to know, but authorities refuse to speculate.
Casey Cox, the sheriff department's lead investigator, explained that officials want to be careful about what they release, while acknowledging that this case is personal to many: "There's a lot of emotion that goes into this case just simply based on the age of these children."