Cat suddenly dieing

Today our cat suddenly died he had all his shots healthy only 10 months old a little chunky he was mostly a indoor cat  we left the house for a couple hours when my mother called she had stopped by to visit when she was waiting for us to return she seen him laying beside our chairs she started talking to him he always would meow like he was having a conversation with you he didn't respond she started petting him and realized he was extremely stiff and had foam in and around him mouth there was no pee or poop around we are so heartbroken and have no clue what happened please if anyone may have a clue to what happened please share with me

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