How to delete specific class after seat deletion return

Question

I’m trying to eliminate a class after deletion in bank, in the script I had deleted li with this line here in my code:

$el.parents('li').remove();

But my need is another, when returning from a deletion I need to eliminate the class that has the image displayed to the customer, but I have no knowledge in JQuery to accomplish what I need, even searching.

<div class="masonry-gallery columns-5 clearfix">
<a class="image-hover lightbox" href="<?php echo $ImagemArquivo->Caminho; ?>" data-plugin-options='{"type":"image"}'>
    <span class="image-hover-icon image-hover-dark">
        <i class="fa fa-search-plus"></i>
    </span>
    <img src="<?php echo $ImagemArquivo->Caminho; ?>" alt="...">                            
</a>
<button name="btnExcluir" idcooperadoarquivo="<?php echo $ImagemArquivo->IdCooperadoArquivo; ?>" cpf="<?php echo $ImagemArquivo->CPF; ?>" class="btn" type="button" >Excluir</button><br />
    <div class="alert alert-warning margin-bottom-30">
        Nenhum arquivo para exibição.
    </div>

What I tried to do:

function(response){                                     
if (response.codigo == "0") {                               
        $("#msgResult").html('×Close' + response.mensagem  + '');   
            // OCULTANDO A MENSAGEM DE ERRO E REDIRECIONANDO
            window.setTimeout(function() {
                $(".alert").fadeTo(300, 0).slideUp(300, function(){
                    $(this).remove();   
                    window.location.href = "iGaleria.php"; 
                });
            }, 3000);                                       
    }                                       
}); 
// TENTEI REMOVER A CLASS DESSA FORMA
$(this).closest(".masonry-gallery").remove();