CHICAGO (CBS) — Fourteen of the painted fiberglass horses you might have seen on the streets of Chicago have been put up for auction on eBay this week, to benefit the Chicago Police Memorial Foundation.

One of the “Horses Of Honor” sculptures up for sale was painted in honor of Chicago Police Officer Thomas Wortham IV, who was killed five years ago. That horse was commissioned by the band Chicago.

After a formal ceremony announcing the opening bid of $10,000 for that painted horse, Wortham’s mother talked to one of the original members of the band Chicago, trumpeter Lee Loughnane.

Carolyn Wortham was asked about her son’s favorite Chicago song.

“Saturday in the Park,” she said. “I guess because I used to hum it a lot, and then he would start to sing it, and he knew all the words to everything.”

Loughnane said he and Chicago were happy to commission the horse.

“Once we understood what the story was and the intention behind the auction – in support of the fallen officers – we were all behind it,” he said.

Proceeds from the auction will go to the Police Memorial Foundation, which is using half of that to buy new bullet-proof vests for current officers.