MS is autoimmune. HIV/AIDS is a viral infection. The diseases and their treatments are night and day with respect to each other. If by "that disease" you are referring to an HIV infection, then yes, complications from HIV often kill people. If you are referring to MS, not so much, relatively speaking. One study found that people with MS live to be 75.9 years old, on average, compared to 83.4 years old for those without.