I may be wrong - but I thought that protection only applied when the two lovers are both alive... Murphy is dead. Susan protected Harry as she was just estranged.
I don't think there's anything in text to support that the protection dies with the lover, no.
The True Love TM protection seems to change a bit from book to book, JB is a bit inconsistent about it, but in general it seems like the True Love TM protection "settles" over the people involved when there is an "exchange" between them, love mutually freely given, they both have to act on said love through sex, it's got a bit of a ritualistic aspect to it. So, it's like the lovers perform their own little ritual and that sets the protection over them. That's why it breaks with the previous person when they perform the ritual with someone else (if they share love too it will settle again, if there's no real love -Luccio- it will wipe the old protection and not create a new one), and why it remains if they don't, even when time passes.
So, I dunno how death would affect it, I tend to think it doesn't. From a writing perspective, why would JB made sure to let us know that Harry did share True Love TM with Murphy and enjoys that protection from it, only to have it disappear with her death? When it's more interesting to make Harry suffer by having him needing to voluntarily give it up in the marriage?
Also, it's an useful tool if he plans to have Harry not succumb to/be protected from the White Court mojo he's probably going to be surrounded by in the next book.
But I'm sure that's one of those things we're going to learn about in the next book.
It'd be interesting to see how that resolves, considering that Thomas pointed out at even objects can be affected by the True Love TM protection.
I do not remember that being said in text. Do you remember if after Karin's death Harry touched Lara?
Some fans will say they have touched at the end of Battle Ground, shaking hands when they agreed to work together to find Justine, don't mind that, they are forgetting that while they shook hands,
Lara was wearing gloves. So, no, they haven't had skin to skin contact since that time he burned her in Peace Talks.