The one that most people remember was the North Hollywood bank shooting, but don't really remember any others.
Would it also be reasonable to say that mass shootings of the type that make the news are usually committed by people that do not actually expect to survive the event anyway?
This is true from the statisctics put out by the DOJ or FBI (laziness on my part - sorry, playing daddy day care at the same time) in that active shooter incidents generally last for around 12-13 minutes, and are often resolved when the offender takes their own life upon arrival of emergency services.
I know several examples have been given in training where the shooters have apparently noticed the sirens arriving on scene and shot themselves, or made a last ditch 'suicide run' where they exit a building shooting, or pointing a firearm, at police in a 'suicide by cop' sceneario.
IIRC, the Aurora Cinema shooter was wearing body armour? But as I said, this may be the exception rather than the rule.