They mentioned that the guinea makes the sound "cheet cheet", so I thought a boy.
But yes, please, if you can, post a video of it making the sound (upload to youtube then put the link here)
First, very sorry for your loss.
Second, most tractor supply's offer a replacement for your dead guinea/chic, in case you didn't know.
Third, if it makes a cheet cheet call it should be a male . You can't really tell by looks, only a little bit if you had other ones to compare it to..