I'm glad to hear they caught him.
What are they going to charge him with? Are they going to try to pin him with any kind of assault, battery or robbery?
Be sure to drop in and say "hello" at the District Attorney's office. Find the assistant/deputy DA assigned to the prosecution and tell him that you would love to testify, if needed. Have them keep you up on the proceedings.
There will most likely be a plea bargain, but you should have the right to attend the sentencing. Attend the sentencing and find out if the victim is allowed to make a statement before sentencing - it is usually allowed. Don't whine or ask for heavy punishment, but give a statement about what was stolen, how hard you worked to earn the money for the headphones, how you lost your medications, and so on. Then thank the Court profusely for allowing you to speak.
It might or might not make a difference, but the judge might slap him with a little extra punishment because you're there.
One last thing - be sure to ask the court for restitution. Gather receipts, bills, etc. and ask for it. The really wonderful thing about restitution is that there's no getting out of it. Bankruptcy won't clear it and there's no statute of limitations. Even better, if you don't make payments or ignore it, it's usually a probation violation and the guy will get a little time in the cooler for not making the payments.