The right fielder was dead when they went to the right field. None knew when he died nor how long he had been lying there.
The cause of his death was also unknown.But they thought he was probably shot by somebody or he fell down and broke his neck during chasing a ball.
They buried him in the right filed, and prayed without thinking of pray.
He was not a star player nor humorous one. They would soon look for another right fileder.
But this thing is not so important for them, but just a trivial accident of juvenile.
If anything, they are possibly all outfielder of Baseball world. They are ordinary player in short period.

外野にライトの選手を埋めちゃうなんて、信じられないリアクションでした。けど、これって、彼が、out fielder(outsider)だというだけでなく、自分たちもおそらく、ほんの一時的に野球をやっているだけであろうし、一人の死なんて、世の中では、たいした事件でないって、言ってるんでしょうか？
どなたか、解説しください！

We found one of our teammates, the right fielder dead after chasing those missing balls. What the cause of his sudden death ? After roaming various reasons, we came to conclusion that he chased a ball, made a big dive and broke his neck. He was loner, an ordinary man without sense of humor, maybe a typical outfielder whether or not he wanted so. We decided to bury him there to avoid a further tragedy. On the other hand it is also true that we didn’t want to forget him. Whenever we do the talk we look back being over the hill as well as those major league players, especially Mays who reminds us the late teammate.

The right fielder died without our noticing it. We talked about what really killed him but no one knows the truth.

We buried him in the ground. Although he was an "outfielder", a-not-important player and just an ordinary guy, the grave reminds us of him and we want new right feilder to be notice it and to wonder who played before him.

ちょっとさっき書いたのとは違うけど大体こんな感じだったかな。。うう。目がかすんできた。

最後のパラグラフはうまくまとめられませんでした。野球人生なんて短いもの。長くても４０くらい。それも本の一握り。大体は芽も出ず17歳くらいで燃え尽きてしまうもの。ってことが言いたかったのか？

外野は孤独と言うけど、、それにしても突然死んじゃってグランドに埋められちゃって足で踏み固められるなんて。。。うーん。。