Time to start smoking.

That stinks ... they should be punishing the person that came late.. not the person that stayed to cover.

I'm all 50 states, it's illegal to refuse someone pay it they work 40+ hours a week.

you should "take a smoke break" next shift

You must work for Walmart they tried that with me and I said "overtime or I'm leaving" they can't force you to work a second shift.

Like other people have said, I'm pretty sure it's illegal to not pay you overtime if you're working a certain amount of hours. Also, I know it can be hard, but this is a situation where using the word "no," would be best. They already have you working long hours and ask you to stay even longer, without paying you properly, because they have an unreliable employee. They're pushing boundaries to see what they can get away with. If you let them treat you like this now, they won't stop, they'll try and take advantage of it every chance they get. I've seen it many times before and many employees just let it happen. Your relief came, your job is done. The fact that he left is not your problem or responsibility, it's the stores to either find what happened to him, or get another person.

Well f**k them.

How was this person allowed to take a smoke break when he had just arrived?

its only overtime if its more then 40 hours a week. so if OP is part time and would be less then 40 hours even with a long day. no overtime.

It's absolutely not illegal to not pay someone for overtime. It depends on their contract. For example, I'm a salaried employee in at at-will state. Either party can terminate the contract for no reason at any time, and I get the same paycheck every two weeks regardless of hours worked. The exception is FMLA. No money. If I start working 35 hours every week though, I can be terminated. Typically it's 45-50. Sometimes 70, sometimes 37. Same paycheck.