I've seen the documentary about him. It's called "Honest Man," and it really does endear Dwyer to the viewer. I, for one, believe he was innocent. The governor of Pennsylvania at the time pretty much railroaded him when he refused to sign off on the release of state taxpayers' funds to cover a variety of the governor's personal expenses and dalliances. Dwyer was accused of accepting a bribe in exchange for awarding a state contract to a company that was designing a computer program designed to calculate the amount of overpayment that state employees had made on their federal taxes.
The evidence against him was highly questionable. He never received the bribe he was accused of accepting (so no paper trail) and at least one of the people that testified against him did so after being intimidated by third parties. They also moved the trial from the state capitol -- where a more learned jury would have been available -- out to the sticks for the purpose of seating a jury that was largely ignorant of the ins-and-outs of the charges and the evidence at hand.
The main reason he chose suicide was to protect his family financially. He had been a state employee for most of his life, had racked up a sizable pension (something around $1.5M, if I remember correctly) as a result, and was exploiting a loophole in Pennsylvania state law that stated that the pensions of state officials convicted of felonies was forfeit only after the sentencing phase had been concluded. He held this press conference on the day he was scheduled to be sentenced, prior to the proceeding itself. His family received the full pension.
It's a sad story, really. Even though he was a politician, Dwyer was a good guy. He got fucked over for refusing to play ball with the cronyism and good-ol'-boy culture so prevalent in American politics. He never would have had to serve his full sentence, but his family would have wound up financially ruined. So he did what he thought was best by them, and I can respect him for it.
Also, I'd like to see the full speech should you ever get around to posting it. I've searched high and low for it to no avail.
I saw it live. I was in high school at the time and school got out early due to snow and I was watching TV. I just sat there I didn't scream or anything and the news showed the footage over and over.