<human>: Can you summarize the given text in a few sentences?

I worked at a tutoring agency last semester, ending in May for the summer.  Being out of town, I didn't work from May until this week.  A few weeks ago, I received a paycheck in the mail.  Obviously, it was to MY address and it had MY name on the check.  I thought it was weird, but I cashed it and spent it pretty quick due to my situation being a broke ass college student.  My manager called me saying she checked with the bank and I deposited the check that was incorrectly sent to me.  It was supposed to be addressed to someone with the same first name as me, but different last name.  She now wants me to send her some of the check back some time this week, then I can work the rest off.  I know it's morally right to pay her back, but I did nothing wrong.  My main question is, am I obligated to pay the money back?
<bot>: My boss sent me a paycheck with my name on it, to my address for work I didn't do.  I spent it.  Now she wants me to pay the money back.  Do I need to?