The Night Stalker pilot movie. Darren McGavin. Best of the entire series, IMO.
This is part one.
http://www.youtube.com/watch?v=pJ3JSZBWjYc
Very strange you should mention McGavin. Just yesterday I watched two episodes of Kolchak on Youtube. Just simply had the urge. Otherwise I watch a lot of Audie Murphy westerns on Youtube.