Removing PictureBox

My issue is that when one picture box comes into contact with another which is found from a list, an event triggers. The idea is that once that event has triggered, the second picturebox ceases to exist. I dont actually need that to happen, but it has to stop running the code after the first time.

The two ways I came up with were:

1) Remove it from the list
2) Delete it outright

Problem is, I cant get them to work.

PictureBoxList.Remove(pb) Doesnt Work, nor do any other ideas from online. Hours of googling hasn't found a solution, none of them work. Most likely its my syntax, but I cant figure it out.

My code is here, with simplified names & redundant code taken out:

For Each pb As PictureBox In PictureBoxList
       If pb.Bounds.IntersectsWith(PictureBoxChar.Bounds) Then
                
                'Event
                'Picturebox From List Destroyed Here

       End If
Next

Thanks in advance,