An Allentown man allegedly observed selling heroin in the 100 block of Main Street in Hellertown is facing felony drug charges, according to court papers.

Katon D. Williams, 35, of 135½ Green St., was spotted making a transaction by officers from the Northampton County Drug Task Force, who were conducting surveillance in the area on Thursday afternoon, according to an arrest warrant on file.

A search of Williams' car, a BMW X5, revealed that he had more heroin stored there, the warrant says. He was also carrying $2,130 in cash.

Williams was charged with delivery of heroin and possession with intent to deliver heroin and committed to Northampton County Prison in lieu of $150,000 bail, following his arraignment before night duty District Judge Patricia Romig-Passaro of Bethlehem.