The one example the summary gives is murder because that was the most egregious attempt at covering up the Stingray's use. The examples of smaller crimes begin in the first sentence of the article.
BALTIMORE - The crime itself was ordinary: Someone smashed the back window of a parked car one evening and ran off with a cellphone. What was unusual was how the police hunted the thief.
There are a few more.
Police in Tallahassee used their stingray to track a woman wanted for check forging [...] Tacoma, Wash., police used theirs to try to find a stolen city laptop [...] Other departments have acknowledged that they planned to use their stingrays for solving street crimes.
And they're not just going after suspects; if you might have witnessed a robbery, your phone is apparently fair game, too!
Usually they were searching for suspects, but occasionally, the records show they used the devices to track down witnesses. The most common use by far was solving robberies.