Dear {Name},
I am so embarrassed and regretful. I can't believe I walked in on you {using restroom/dressing/being intimate}. I didn't realize you were in there. I'm sure my mortification is nothing compared to your own. In fact, I wouldn't extend the awkwardness by bringing it up now, but I felt it was important for you to know that I {purchased lock/changed my practices} so this will never happen again.
Please pass my apologies along to {other party} as well. And then let's pretend this never happened!
Sincerely
{Name}
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Index of letter of apology templates