jackie benson joins us live with what we're learning about the assault. jackie? >> well, we can tell that you the security camera images are very clear and we hope that you will take a minute to look at them right now. it's very important. now they show the man who police believe got into this building, we're in the 1500 block of key boulevard in arlington around 10:00 this morning. they still don't know how he got in. he went up to a floor of the building and began knocking on every door saying he was from maintenance. no one opened the door except for one woman. she was then sexually assaulted. >> this was a very brazen attack. he not only would go around knocking on them, but he was using that ruse knowing someone would open their doors thinking that someone who worked there was actually on the other end. >> we tell people that look through your peephole f you don't recognize that individual, you don't have to open your door. >> and that is tremendously important advice to pay attention to. anyone who recognizes that man, the backpack he was wearing, call arli

they believe somebody has got to know this guy. >> live in arlington, jackie benson, news 4. >> thankou. >> tonight in prince william county, law enforcement came together at a memorial and vigil for the 17 men and women who lived or served there and have died in the line of duty. among them officer ashley gwinden who was killed in her first full day on the job. today the officer's family was one of five added to that fallen officer's memorial outside police headquarters here in the district. prince william county police officers and windon's family were there to see it today. news 4 talked to her aunt and her uncle he is ceremony, the first time the family spoke publicly about her death. >> irt was a so it's just her life was remembered about serving others and not just her son. >> the officer's aunt and mom plan to join hundreds of bicyclists traveling to washington this week in honor of fallen officers. >> to state the obvious, you don't want your national security adviser compromised with the russians. >> former acting attorney general sally yates said today several red flags shou

ja jackie benson joins us live. what can you tell us now?> reporter: leon, it appears this man got into in luxury high-rise condominium building by the parking garage. the security camera images show a man wearing a hooded sweat shirt standing near the garage entrance of the adream condominiums on key boulevard in clearly on camera inside the building as is his under armour backpack. police say that just before 10:00 this morning he knocked on every door on one floor of the building, claiming to be a maintenance worker. one woman opened her door, then police say she was sexually assaulted. the crime shocked residents of a neighborhood they describe as very safe. >> i just feel like -- it is really quiet after hours. >> you're with -- but after advice for everywhere you live, so -- >> reporter: investigators were on the scene throughout the day and into the evening. >> this was a very brazen attack. you know, he not only was going around knocking on them but he was using that ruse, knowing that somebody would open their door, thinking somebod