A woman who had nothing but love for the homeless was killed at the Fullerton L stop a few days ago. The incident occurred after a thief stole an iPhone off another passenger; during the getaway, the robbery became much more serious: He pushed a Sally Katona-King, age 68, back down the stairs leading to the platform. At the time of this writing, he’s still on the run.

It’s a tragic event.

But technology may aid Chicago police in their manhunt, one expert at MSI Detective Services in Chicago says.

Police have released a sketch of the suspect they’re seeking, but detectives are not talking about exactly what steps they’re taking to find him. The suspect stole an iPhone at the Fullerton station March 28, then pushed Sally Katona-King down a flight of stairs as he fled the scene.

King, an advocate for the homeless, was buried last week.

A private eye at MSI Detective Services believes police must be making a serious effort to track the stolen iPhone. The devices are not just phones, they’re also mini-computers with individual identities and tracking systems.

“There’s something called the IMEI number that’s sort of like the serial number of the phone, so even if the SIM card or something like that has been changed, it’s still trackable,” private investigator Theresa Cheriachangel told CBS 2’s Mike Parker.

Andrew Holmes, a community activist who’s helped put together $1,000 reward for the arrest of the killer, was passing out flyers at the L station this week. He was telling cta riders who may have been victims of theft on the trains in the past to tell police about it.