I've been an attorney since 1995. Most recently I was General Counsel for a large internet company for 4 years, doing corporate, contracts, transactions, mergers & acquisitions, intellectual property, employment, etc... However, after we sold the company multiple times, I eventually left. Now I am a partner in my own small law firm doing mostly high-tech startup ventures, and thinking about which direction I want to go next.
I know of a similar occurrence to your death penalty case, with my ex-girlfriend. Her first trial ever was a murder case. She won, against the odds, but it was very nerve-wracking. She went on to be an excellent public defender.
Good luck with criminal law, and with the bar. Criminal law is a difficult road to follow, but it can be very fulfilling at times it seems (and heartbreaking other times, or so say my ex).