police are eager to unravel the mystery. >> we tried to keep the serious tone because he broke into an apartment where single young women live. they didn't know, were they dealing with someone who has a sexual predator background or were they dealing with just some kook they didn't know. >> so not only do the police release the surveillance tape to the media but they post it on the internet. and with a quick click of the mouth this invader's bare essentials debut around the world. >> he was able to walk right into the front door. at the time he's not dressed like you would expect an adult man to be dressed at 4:00 on a friday afternoon. >> the suspect tries to open different apartment doors to see if he can get in. >> found one that was unlocked, went inside, took his clothes off, trashed the place, left with a laptop computer, and he left behind his clothes. >> at this point the surveillance camera captures the suspect running down the hallway, completely buck naked. >> we live in philadelphia, a city that has seen 300-plus murders in a year.