I'm sorry for you loss. Haworthia's can be very sensitive, IMO. Maybe your specialty is with a different type of plant or succulent. A friend of mine cannot keep succulents alive, but has many, many other plants thriving. For me, keeping other plants alive are challenging, but succulents seem to be my sweet spot.I think it's dead I just don't have a very good green thumb.
How are your other plants doing?