<human>: I started a new job about 3 months ago with a company that was launching a new program. I picked up on things quickly and my managers have been really impressed with my work, but they needed to hire help for me because the volume of work was/is increasing.

They hired my help a little more than a month ago. My new coworker was kind of awkward but nice enough. But after a few weeks, it was apparent that his work wasn't up to par. I had been charged with checking his work everyday and I was still constantly finding errors. I discussed this with my managers and they pulled him into the office to talk to him. We all hoped he would shape up.

Unfortunately, things didn't get much better. He always seemed eager to do well but it never translated into his work. The biggest problem was a glaring lack of attention to detail, which simply doesn't fly in our line of work.

They called him into the office one last time and told him basically if he wasn't capable of doing all the duties I do, he wouldn't have a job there. So they instructed me to be a ghost one day; he would do all the work and I would check everything and we would decide if he would keep his job.

Needless to say, I caught several errors and I was a bit fed up at that point. I was tired of babysitting. My managers and I agreed that our gut feeling was that he wasn't going to work out. They are going to fire him Monday and it's going to be really awkward.

So I guess I have survivors' guilt. I am a newer addition to the team but my managers trusted my judgement enough to make this call based on my input. If I said we should give him more time, he wouldn't be losing his job next week. At the same time, I feel like I made the right decision. You cannot change someone's nature so as to make them pay attention to details. Plus, I had concerns about his dependability that I did not even voice to management; he overslept for work twice in a one-month span, I caught him nodding off at his desk a couple times, etc.

Sorry for my long ramble.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: I essentially put the nail in the coffin on my coworker getting fired. I feel guilty; how do know I (did I?) made the right choice?