I agree most spies do not carry multiple identities around with them and put themselves out there exposed.
I do find it interesting that she used multiple aliases, and in many cases of that, the people just tend to be complete and total weirdos. I point to Lori Ruff, Joseph Newton Chandler, and Kimberly Kessler's cases if you want to hear shocking stories about extremely strange behavior by identity thefts. (Two small tidbits, according to his coworkers Chandler once drove over 500 miles to an outlet store and allegedly drove back immediately because "there was no parking". Kessler was once seen eating raw ground beef wit her hands)
For two cases of spy deaths under mysterious circumstances, I recommend:
1. Ralph Sigler, a US Army double agent who was feeding the KGB with secret level documents that where actually incorrect information. He failed a polygraph administered routinely by the US Army and was found in hotel, allegedly dying by suicide by stacking up items to elevate a chair, bounding his biceps with electrical cables, inserting them in the outlet, and dipping them in a cup of water. Ruled suicide, of course.
2. Gareth Williams, an MI6 spy who was also wrapped up with Russians. He was found in a hotel room with the heat on full blast in the summer time, with a wardrobe of wigs and women's clothing. He was found in a bathtub locked inside a duffel bag, with the lock on the outside, without any of his fingerprints found anywhere despite the lack of gloves inside the room anywhere, or in the bag with him. Oh, also ruled suicide, shocker!