By Brad Segall

NORRISTOWN, Pa. (CBS) – Montgomery County Commissioner Bruce Castor will get some national TV face time tonight during a cable program that takes a look back at one of the high-profile cases he prosecuted while he was district attorney.

Castor will be featured in a show detailing the murder, the investigation, and the prosecution of former Main Line chef Guy Sileo.

Sileo was convicted more than a decade ago of murdering his friend and business partner Jim Webb at the General Wayne Inn in Lower Merion. The show “Cold Blood” will air at 9 p.m. on the Discovery ID channel.

Castor, who will offer insights and expert opinion, says it was a hard case to prosecute because it was largely circumstantial.

“The case was actually won during investigation and then when the pieces were assembled at trial it became clear but up to that point it was very difficult.”

Sileo is serving a life sentence for first-degree murder. This is the second time Castor has been featured on the program. It also did a profile of the Craig Rabinowitz case.