Looks fine.

Thanks mesembs. Then I will water it today.

Is that leaf soft (or started that way) or just dry?

Rina

Well I can't tell anymore since its dead. I didn't notice anything earlier and didn't check them daily the last few days because of work and today I saw this dead thing.

Ok just went to touch it, it's soft not crunchy.

Old leaves on all succulents will eventually start shrivelling, dry up and die - nothing unusual there.

Soft & mushy could be sign of overwatering. I can't tell what is happening with your plant - I have few aloes and old leaves occasionally dry up, but they are not black, rather tan color and feel almost like a paper (but stiffer). I do not keep photos of old, dry or drying leaves, but here is one on Aloe maculata - they always look like this: