My condolances. Asthma is a very complicated disease. I read a study that demonstrated that people who don't have chronic asthma have a higher fatality rate than those who do. Presumably because those with chronic asthma always have a bronchodilator such as albuterol on hand at all times. Attacks can be sudden, and it's like falling off a cliff. The rapidity with which the situation deteriorates is frightening. The patient who has just developed asthma, or has only had an attack or two, may be reluctant to summon immediate aid. It's natural not to want to bother people. That reluctance can contribute to a very bad outcome.
This is a very sad story. Respiratory arrest is when the breathing stops. This is not a common problem, but obviously can occur with both asthma and with pneumonia. All asthmatics are vulnerable to having a severe attack and suffering a fatal outcome. Unfortunately, this is not well known by the public.