Published: Apr 07, 2012 3:49 AM EDT
Updated: Apr 07, 2012 4:13 AM EDT

CAPE CORAL, Fla. -- A WINK News exclusive.  A letter of confession.  Cape Coral man, Garrett Kern, wrote the letter to his step-grandmother.  In it, Sally Arthur says Kern confesses to killing her husband.  Kern is behind bars charged in James Arthur's murder.

The three page letter is dated November 7, 2011.  Four days after Kern allegedly killed his step-grandfather and went on the run.  James Arthur's widow says she considers the letter a confession.

In a letter exclusively obtained by WINK News, Garrett Kern writes to his step-grandmother, Sally Arthur, and tells her what happened to her husband.

"The letter tells all about Garrett and what took place with Garrett the day that he killed Jim," said Sally.

The body of James Arthur, known by his family as Jim, was found in a Cape Coral neighborhood November 3.  The letter paints a disturbing picture of what happened leading up to Jim's death.

"He doesn't say in the letter what he did with Jim or anything but its a confession," said Sally.

According to the letter, Kern says they went to Arby's on US41 in Fort Myers after Jim picked him up from probation and parole.   They started to have words.

"Jim grabbed his hand and he slapped his hand, that Garrett slapped Jim and then Jim said to him what are you trying to do be a tough guy?" said Sally.

Kern then writes in the letter "that was when the physical confrontation began which lead to me choking him.  After realizing what I had done, I was scared and jumped in the driver's seat.

"He doesn't say he moved him he says I just jumped into the driver's seat so he had to have had Jim out of that car because of the gear shift and everything," said Sally.

Sally said this letter doesn't bring her closure.

"I felt that like maybe I could forgive him until I read this letter," said Sally.

She hopes someone saw something in the Arby's parking lot that November afternoon.

"It would make me feel like this is truly closure now.  That somebody saw him do this," said Sally.

The Arthur Family tells WINK News, Kern's attorney approached them with the idea of a plea deal but they decided against it for now.