LOUISVILLE, KY (WDRB) -- Billy Davis, the gunman behind Tuesday's workplace shooting at LG&E, is described by friends as a good person, even called perfect. But they and Davis' co-workers don't understand why he walked into work and shot his boss in the head.

"We don't know the minds of people and sometimes minds break," says Abe Mills, Davis' former Valley High school classmate. He is still shock after learning Davis was the triggerman. "They said one of the Davis boys and I said, "Well, I started thinking which one and said well, you know it ain't Billy. Right off the bat you knew it wasn't him," thought Mills.

But Louisville Metro Police say Billy Davis in fact managed to get a gun through LG&E's security. The 53-year-old then shot his supervisor, Andre Johnson, in the head, killing him. Then Davis turned the gun on himself.

The divorced dad had just recently moved into a southwest Louisville home. "His dad passed away and then moved in with his mother," says neighbor Delana Thacker.

Davis's family was too distraught to talk on camera. Bessie Grubs knew Davis and struggles to understand why the boy she calls perfect acted so violently.

"I cried. I really did," says neighbor Bessie Grubs. "I lost two of my sons so I know what she's (Davis' mother) going through."

"We were just shocked because no one knew anything about him," says Winnie Allen. She lived across the street from the victim, Andre Johnson.  "Just coming and going and never bothered no one. Quiet."

Allen says the Clarksville, Indiana resident had very few friends visit. She says the 52-year-old kept to himself as he worked in his yard. "The way he always did a good job with landscaping, I watched him fix those bushes over there and those flowers and I thought he must of had some experience in landscaping," says Allen.

The flag flew at half-staff over the LG&E substation on Jennings Lane -- a quiet contrast to Tuesday's violence. Inside, grief counselors spoke with employees who wrestled with the question -- why?

"He wasn't the kind of person who would intentionally go out and do something like that. So that's the shock of it all," says Mills.

OSHA investigators were at the substation today to figure how Davis got the gun into work.  We checked with LMPD and Davis does not have a criminal history.