How did LE figure it out?
Two things would warrant further investigation:
… Drives a white Hyundai Elantra
… Tips (Name someone you know who is weird and drives a white car.)
One thing would make BK a Named SUSPECT:
… Video around 3am that day that shows the license plate on the Hyundai Elantra.
Two kinds of evidence would PROVE he did it:
… BK’s fingerprints, touch DNA or blood DNA at the crime scene.
… A victim’s blood on one of BK’s possessions (car, item in his dumpster, apartment, office, etc.)
What did I miss?