PHILADELPHIA (CBS) — The man who allegedly stabbed Philadelphia City Councilman David Oh has a preliminary hearing.

Charges against Shawn Yarbray include attempted murder, robbery and aggravated assault.

Investigators say Yarbray approached Oh outside his Kingsessing home on May 31, demanded his car keys and stabbed him.

Yarbray’s attorney says his client denies the charges.

Oh went back to work a couple of days after the stabbing.