Andy Matesi, 56, a father of two from the Northwest side of Chicago, says he was only thinking of how to make a good investment when he began sending Gacy money in prison in the early 1990s in exchange for the convicted murderer's artwork

Gacy produced and sent him over 200 paintings featuring a character he called "Pogo the clown,"

One painting depicts Gacy's house — 8213 W. Summerdale — with a smiling clown above an outline of the crawl space where Gasy, in real life, buried dozens of his murder victims

Matesi said he's been told his collection of creepy Gacy "murder-o-belia" could be worth hundreds of thousands of dollars,

But his days as a would-be art dealer may be numbered

Five states have passed laws to put people like Matesi out of business, and Congress is considering a federal bill that would punish inmates who try to make money by mailing out items from prison

Gacy,

was put to death by lethal injection in 1994. He was convicted of the rape and murder of 33 boys and men.