I didn't hear about Scott's threats before. Could you tell us more about it?
The event occurred on March 21, 2005 Edition of the Dom Giordano Show on 1210AM WHPT, which is Philadelphia's blowtorch station.
It's no longer in Dom's archives, but I dug up the Live thread for the Dom G Show for that day, which contains the info...
SCOTT AND STEVE SCHIAVO TO BE ON DOM GIODANO 1210 AM PHILADELPHIA!!!
That's the only link that I still have. Dom G doesn't have it on his page anymore. You might be able to find a discussion of it in the Hannity Broadcast from Philadelphia Transcript from around that time (3/21/05), although truth be known I do not listen to Hannity all that much. It came up on there, too.
Lastly, there is Glenn Beck's website, which I will search next. I don't like only having one source left.