Can I Be Charged As An Accomplice If I Know Someone Has A Felony Warrant And Don't Tell The Police?

Hi. I'm not 100% sure what to do. For reference, I'm in the Kansas City Missouri area. I recently got a new coworker. She's been working with me for about 2-3 weeks now, so I don't know her super well. I do know that she seems to have a lot of drama with her boyfriend. Anyway, we were chatting last night, waiting for the next shift to arrive. She's said before that she picked her boyfriend of 2 months up from Mississippi and now they are living together here in Missouri. I don't know anything about law, but I'm just going to say what she said, even if it's not actually how law works.

She said that her boyfriend is trying to get custody of his young son. But before he can do that, he needs to pay for his warrants. We were laughing together and I thought the mood was light, so I asked what he had warrants for. I figured it was going to be something simple, like a failure to appear for a traffic ticket. She goes quiet for a minute, then says that one is for fleeing from officers and the other is for murder..... She goes on to explain that it was a self defense situation where his brother was killed and he killed the two people responsible. It happened in Mississippi. I don't fully understand everything she was saying, but she said the case was dismissed by Mississippi, but he still has a warrant for a grand jury or something like that. Again, I have no clue how any of this works. She also said that technically, she could have gotten in trouble for harboring a fugitive and transporting him over state lines, but that she won't get in trouble now that they're in Missouri. What do you say to that? So I just laughed it off and agreed with everything she said.

Now a day or so has passed and I was thinking about it. I'm so bad at keeping secrets, so I was talking to a friend about it. The friend said that she shouldn't go around talking about that kind of thing. Then I realized that I may be considered an accomplice or something since she told me. I don't know this man, his name, or where they live. I've never met him. I don't know anything about her besides her first name and that she works for my same company. Now I feel like being told this information has put me in a horrible position. I don't want to be that person who goes to the cops and gets a coworker in trouble. That would cause so much drama around the workplace, especially since a lot of my other coworkers like her so far. But I also really don't want to end up in prison.

So can I be charged with anything if I have this information and don't say anything?