Published: Oct 22, 2010 10:56 PM EDT
Updated: Oct 22, 2010 5:44 PM EDT

LEE COUNTY, Fla. - WINK News is uncovering new details about the suspect in the murder of a South Fort Myers father. Deputies arrested 37-year-old Brian Casey in connection to Ryan Vanderson's death. A man who knows Casey says he witnessed Casey's violent streak.

Rick Campbell's business is near the company Brian Casey owned. Recently, Campbell says he called the cops when he saw Casey beating his girlfriend.

"Threw her on the ground, her head hit the ground. Then forced her in the drivers seat. Made her take off. By the time the police got here he was gone," Campbell said Friday.

Now, Casey's accused of first degree murder and arson. Deputies say Casey shot salesman Ryan Vanderson in the head during a business meeting at Vanderson's home, and then, allegedly returned to torch the house. Campbell says he's not surprised by the arrest and tried to warn authorities a month ago.

"I was a little bit frustrated. I told them, I thought somebody was going to be dead before they caught him," Campbell said.

Casey's rap sheet goes back more than a decade in Lee County. On his Facebook page, he describes himself as a "quiet, good man", but capable of "explosive action". Still, Vanderson's friends wonder what happened.

"This guy didn't have any enemies, and that's what made the news so puzzling initially. Is trying to find out who would do something like this?" Vanderson's longtime friend Brad Beckwith.

At the time, Casey was out on bond for a separate crime in Lee County. He's currently being held without bail, while Vanderson's loved ones grieve.

"Ryan was a great man, he had a big heart, and he'll be sorely missed and remembered forever," Beckwith said.

A fund is now in place to help Vanderson's wife and 2-year old little girl, Ryann, with new-found financial expenses:

Ryan Olyvia Vanderson College Fund: Bank of America: Account #: 8980 4240 8458