Published: Jan 21, 2014 7:59 PM EST
Updated: Jan 22, 2014 10:58 AM EST

LABELLE, Fla.- You'd never guess from Jesse Korff's smiling Facebook picture, that beneath that smile lied a potentially dangerous 19-year-old.

Elizabeth Justice lives only a few feet away from Jesse's home in LaBelle, and the scene of the crime. Justice dates Korff's cousin. 

"Jesse's not someone he (my boyfriend) would hang out with. My boyfriend doesn't talk about that side of the family," said Justice.

Korff's social media activity shows an angry person. A post from July 2011 on Korff's Facebook says, "I need to get the (expletive) out of this place before I kill someone."

WINK News looked into Korff's past with the law, and found a small rap sheet. Korff had previously been picked up for possession of marijuana and firing a handgun at a shed.

"When my boyfriend starts talking about Jesse, I'm like what are you doing, we start talking about something else. Got a lot of drug addicts in my family," said Justice.

There's also a 2010 report from the Hendry County sheriff's office, citing child and elderly abuse. 

Korff lost both his parents, and was in the care of family members. In the 2010 report, his family told authorities that Korff "is ungovernable, taking drugs including pot, pills and possible crack," and was "threatening to take pills to end his life since he was unable to deal with the death of his parents."

WINK News found a Google Plus account for Korff. In the profile, Korff says he is a worker at McDonald's. He graduated from Florida Virtual Academy and is a student at Edison Community College.