Final answer:
The question requires distinguishing between 'spree murder' and 'mass murder,' as defined by Dr. Sue. 'Spree murder' involves killings at separate locations in quick succession, while 'mass murder' is multiple killings at one location simultaneously.
Step-by-step explanation:
According to Dr. Sue, spree murder involves multiple victims in separate places occurring in a relatively quick sequence, while mass murder includes multiple victims, occurring in one location at approximately the same time. Spree murders are characterized by the lack of a cooling-off period between the murders, which distinguishes them from serial murders.
On the other hand, mass murders involve multiple killings that take place in a single event and are often perpetrated in a public space, such as a workplace or school. Both forms of violence are deeply tragic and result in the loss of innocent lives.