I want to offer my whole-hearted apology for {not following up/flaking on charity event/not showing up/etc.} like I'd indicated I would. It's easy for me to say that "life happened," but the bottom line is that I didn't follow through and I feel just awful about it.
I hope that I didn't put {you/organization/candidate/etc.} in a bind. Please know that I am truly committed to this cause.
Enclosed please find my donation in the amount of {amount}.
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Index of letter of apology templates