The NTSB released final reports this month blaming two fatal crashes of home-build light sport aircraft on incapacitated pilots following adverse cardiovascular events. Both pilots had previously been issued medical certificates, which had subsequently expired. In both cases, the pilots had histories of severe coronary artery disease, which may have precluded reissuance of 3rd Class Medical Certificates.
Source: avwebNTSB Blames Pair of Experimental LSA Crashes on Medical Issues