It looks overwatered to me. Was it exposed to rain? Do you mean that the top of the soil looked and felt dry or did you check all the way to the bottom? A good method is to stick a wooden skewer into the soil. Pull it out and see if it is dry and free from any bits of soil. That would indicate that it has dried out completely.

What kind of soil is it in? It looks like it may not drain properly. I don't see much perlite. If that is a soil with a lot of peat and organic matter, it can easily get soggy. They don't like damp soil.

Giving it "a little water" when it is dry can be an issue. It's far better to give a completely dry plant a thorough watering. Then, to let it dry thoroughly before you water again. Sometimes that could be weeks or even months depending on many factors.

Are there any relatively healthy leaves that you can propogate? I would definitely try to find a few if possible.

You might want to pop it out of its container and check the roots. See if they're dry and heslthy or mushy and rotting. If there are healthy roots left cut away all of the rotten parts of the roots and leaves and repot in dry gritty mix or 50/50 cactus and Succulent Soil/Perlite. I am not sure it will work, but you might try it.

Unfortunately it doesn't look hopeful to me. But, these fellows can surprise us!

Sempervivums i do not believe can be propagated by leaves. I have tried countless times to bo avail. The first looks like its rotting. Tgese do not make good undoor plants. They need to be outside ALL YEAR LONG to thrive. I live in Michigan and they are just fine through are miserable winters. Mine are planted in the ground, but another forum member, Rina, lives in Canada, and i believe she keeps pots outside all year long, but they are in a well draining mix. Hopefully she will come along and comment. I wish i could help you more if youre going to keep them in a pot, but i dont have much experience with Semps in pots(only had some in pots in the summer)

Thanks for that info, LilBit. I've learned something new. I wasn't aware of that characteristic of sempervivums.

You're welcome ;)

Chefmomster- How are you?? : )

Renee- Lilbit is correct. Sempervivum are not the type of plants to be grown indoors. Mine are grown outside all year. I water them every few weeks but, when I do, I water them thoroughly. Rina will hopefully see your thread and offer more advice for you she is more knowledgeable about these plants than I am.

Here's a thought about your semp death (or near death). I had a Haworthia Magnifica that I overwintered inside. The plant was domed shape and filled most of the pot. I had it under grow lights and watered once every couple weeks. In the spring when it was time to repot I was surprised to find the top just sitting there with no roots attached. I asked my C&S friend what gave. I had a hard time believing I had overwatered since 99% of the water I drizzled over it while it was under the grow lights couldn't get to the soil. That was probably the problem he said. The roots didn't get enough water and dried up leaving only the succulent top growth. Had I resumed regular watering once it went back outside the top would have rotted away as there were no roots to absorb the moisture. Semps don't have much of a root system to begin with, if they dried out when you went away and then you came back and watered you too could have had the rot problem.....Just a thought.... And BTW, I overwintered my shallow bowl of semps in my unheated attached garage over winter and they pulled through just fine.........Maryl

Semps are winter hardy, down to z3 for most of them. They grow best outdoors, planted in ground or containers - just provide well draining potting medium.

They usually suffer indoors from lack of light - that's why they start 'bleaching' (color gets much lighter) and also etoliate - stretch, looking for more light. Leaves start curving 'wrong' way as you can see in OP's photos. Silver king in last photo seems to be suffering from lack of light too.
Overwatering is another very common problem, and from what I can see crown/rosette (pics 2-3-4) appears to be rotting.
If you want to grow them, good light and good drainage are a must (as with all succulents).
I am not sure if you can save the first one - depends on amount of damage. It lost that tight looks it should have and I don't see any cobweb either. The offsets may survive if planted. Second one looks just a little better, but provide better medium and light - otherwise it won't live either.
I don't believe you can propagate them by leaves, they have many offsets (that's why their common name is hens&chicks), but only if growing under appropriate conditions.
I am not sure where are you located - they don't care much for very high temps and lots of (prolonged) humidity.
I grow them in ground and in the containers. They all overwinter outdoors (snow and temps below 0F). They will rot & die if left sitting in wet spot.
I have posted many photos of my plants - but don't want to repeat myself...instead, look at the beautiful semps of another member (Harry from Netherland) - in pots and in ground semps:
click here to see many seps

Rina, is it possible for these Sempervivums to do well in small pots?

(Hopefully Renee doesn't mind me asking/posting this here)

Mine has good drainage and lots of light now that it is outdoors, but it still doesn't look so great! The lower leaves still droop like the photo in the OP.

Or do only the newer leaves grow nicely after the better conditions are restored? Mine changes so little that I find it hard to 'read'.

I agree. these semps are quite hard to "read." I never know if i'm actually doing the right thing by them or not. Then, one day I wake up and there are 20 more of them seemingly overnight!

Renee- Good drainiage a must and all the sunlight you can give it. I think we're all agreed on that.

Rina: That's very interesting about the root system on your semps. I've been given semps and bought more semps then I care to recall and never saw that much of a root system. Even the ones growing prolifically in a friends garden didn't look like yours. You have a real feel for them that's for sure and I now have a goal to shoot for. Thanks for taking the time to post your experience.........Maryl

Rina, do you fertilize them?

Neil
I don't fertilize them - in pots or in ground. They are in full sun, and good drainage. That's all.
I am sure whatever you are doing is right - in your zone, many have problem growing them well (too hot? - typical rating is z3 - z9). But perhaps humidity is more of the problem.

Maryl
The roots will be healthy if there is good drainage, and longer if they have room to spread. I never thought of taking better pics of roots...here is another photo:

Let them be, they should eventually recover-they probably need little more time. And the leaves will look better - only time they don't recover is if they have rotted or dried. Very neat looking pots, all of them.
Rina

I know this was covered a little but it was defiantly a lighting issue that contributed to the death of this plant. Even in the picture you show before you went on vacation it is not what a healthy semp. should look like and is suffering from lighting. You can see how the leaves are getting long, pointing downward and very bleached looking. It should be a tight rosette. I see this a lot when people assume succulents are house plants and keep them in low light conditions inside. Most the time they have no clue that their succulents aren't suppose to look like that.

Sorry abor your plant! Semps are hardy keep it outside next time