Perp arrested in college kids slayings

[ExpressLane]

It sounds like they decided that this is the guy primarily because of cell phone tracking, the police could go back on time and find out that that his cell phone was often near the victims.

Sounds like it was a combination of geolocation, genetic geneology, and photos of his White Elantra.. I bet the search of his apartment will turn up a lot of blood evidence.