9:42 am - 02/21/2013
“Carbon Copy” – When victims are found in Philadelphia in a similar style to victims of The Replicator, the stalker who has been tracking the BAU’s every move, the team thinks this could be the break they need to try and apprehend him, on CRIMINAL MINDS, Wednesday, Feb. 27 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Scott Grimes (“ER,” “Party of Five”) guest stars as suspect Donnie Bidwell.
Source
Criminal Minds 8x16 Promo "Carbon Copy" (HD)
“Carbon Copy” – When victims are found in Philadelphia in a similar style to victims of The Replicator, the stalker who has been tracking the BAU’s every move, the team thinks this could be the break they need to try and apprehend him, on CRIMINAL MINDS, Wednesday, Feb. 27 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Scott Grimes (“ER,” “Party of Five”) guest stars as suspect Donnie Bidwell.
Source
And I'm guessing they're not going to apprehend their stalker until the season finale and there's going to be a big cliffhanger.