oh gosh Lisa, I would have taken him with me! I know you don't need another one, but perhaps this one was telling you he is special? It does break your heart.
Two years ago, we had a strange female appear out of the middle of nowhere carrying something in her mouth- at first we thought it was a baby possum. Turned out to be a kitten. She walked from the back of our property (we had never seen her before) went into the shop and jumped on a startled Mike's lap, dropped the kitten in his hands, and then took off back to the creek! She did this four times- we were incredulous! Mike now had a lapful of tiny kittens barely a week old. We took them up to the house, with Mom following and brought the whole family up to the cat room. All the while Mike is going "Do you know this cat?" I did not nor did he!
About 5:00 that night mom started making a heck of a racket and I went to the stairs, she was at the door clawing to get out. I looked at Mike, then decided to take the chance and opened it. She literally flew past all the other cats, out the cat door and vanished to the outside. About 45 minutes later we heard her meowing so we went outside and she was once again carrying a kitten! Only this time, she was struggling as this was the BIGGEST kitten I had ever seen. I went over and picked the baby up, looked at her and said "Is this it?" She followed me back to the house, up the stairs, where she reunited all the babies. We were still beyond amazed at all of this.
A few days later, I went upstairs to find her dead next to her babies.
Somehow, she must have known that she was going to die and she wanted her kittens to be safe. All the kittens went on to grow up healthy and strong and were rehomed to loving kitty parents. I think if I were you, I would go back and get that stray.