\WICHITA, Kan. (AP) -- The reward now stands at slightly more than $23,000 for information leading to an arrest in last year's killing of a Wichita banker.

An adult son found 61-year-old Timothy McGuigan shot to death in the living room of his Wichita home on Sept. 7, 2011. He was last seen alive working in his yard the previous evening.

The Wichita Eagle reports (http://bit.ly/Sxz4oR ) an anonymous donor added $2000 this week to the reward fund. McGuigan's daughter and son and a business executive group called Wagonmasters recently added $5,000 each.

McGuigan worked for Kansas State Bank as a senior vice president. Police said robbery did not appear to be a motive in the crime, and McGuigan may have known the killer because there was no sign of forced entry.